diff --git a/code/modules/tgui/external.dm b/code/modules/tgui/external.dm
index 4820f2d5828..5de54c439cc 100644
--- a/code/modules/tgui/external.dm
+++ b/code/modules/tgui/external.dm
@@ -107,6 +107,14 @@
 /datum/proc/ui_host(mob/user)
 	return src // Default src.
 
+/**
+ * global
+ *
+ * Associative list of JSON-encoded shared states that were set by
+ * tgui clients.
+ */
+/datum/var/list/tgui_shared_states
+
 /**
  * global
  *
diff --git a/code/modules/tgui/tgui.dm b/code/modules/tgui/tgui.dm
index fd3a5da5c58..3a983bd37ed 100644
--- a/code/modules/tgui/tgui.dm
+++ b/code/modules/tgui/tgui.dm
@@ -42,8 +42,6 @@
 	var/datum/tgui/master_ui
 	/// Children of this UI.
 	var/list/datum/tgui/children = list()
-	// TODO: Remove in favor of useGlobal
-	var/ui_screen = "home"
 
 /**
  * public
@@ -197,7 +195,6 @@
 	json_data["config"] = list(
 		"title" = title,
 		"status" = status,
-		"screen" = ui_screen,
 		"interface" = interface,
 		"fancy" = user.client.prefs.tgui_fancy,
 		"locked" = user.client.prefs.tgui_lock,
@@ -213,6 +210,10 @@
 	if(!isnull(static_data))
 		json_data["static_data"] = static_data
 
+	// Send shared states
+	if(src_object.tgui_shared_states)
+		json_data["shared"] = src_object.tgui_shared_states
+
 	// Generate the JSON.
 	var/json = json_encode(json_data)
 	// Strip #255/improper.
@@ -238,9 +239,12 @@
 		if("tgui:initialize")
 			user << output(_initial_update, "[window_id].browser:update")
 			initialized = TRUE
-		if("tgui:view")
-			if(params["screen"])
-				ui_screen = params["screen"]
+		if("tgui:setSharedState")
+			var/key = params["key"]
+			var/value = params["value"]
+			if(!src_object.tgui_shared_states)
+				src_object.tgui_shared_states = list()
+			src_object.tgui_shared_states[key] = value
 			SStgui.update_uis(src_object)
 		if("tgui:log")
 			// Force window to show frills on fatal errors
@@ -249,14 +253,13 @@
 			log_message(params["log"])
 		if("tgui:link")
 			user << link(params["url"])
-		if("tgui:fancy")
-			user.client.prefs.tgui_fancy = TRUE
-		if("tgui:nofrills")
-			user.client.prefs.tgui_fancy = FALSE
 		else
-			update_status(push = FALSE) // Update the window state.
-			if(src_object.ui_act(action, params, src, state)) // Call ui_act() on the src_object.
-				SStgui.update_uis(src_object) // Update if the object requested it.
+			// Update the window state.
+			update_status(push = FALSE)
+			// Call ui_act() on the src_object.
+			if(src_object.ui_act(action, params, src, state))
+				// Update if the object requested it.
+				SStgui.update_uis(src_object)
 
 /**
  * private
diff --git a/tgui/packages/tgui/backend.js b/tgui/packages/tgui/backend.js
index 65cef786451..0c354834876 100644
--- a/tgui/packages/tgui/backend.js
+++ b/tgui/packages/tgui/backend.js
@@ -1,6 +1,3 @@
-import { act } from './byond';
-import { UI_DISABLED, UI_INTERACTIVE } from './constants';
-
 /**
  * This file provides a clear separation layer between backend updates
  * and what state our React app sees.
@@ -10,21 +7,23 @@ import { UI_DISABLED, UI_INTERACTIVE } from './constants';
  * the response with already existing state.
  */
 
-/**
- * Creates a backend update action.
- */
+import { UI_DISABLED, UI_INTERACTIVE } from './constants';
+import { callByond } from './byond';
+
 export const backendUpdate = state => ({
-  type: 'backendUpdate',
+  type: 'backend/update',
   payload: state,
 });
 
-/**
- * Precisely defines state changes.
- */
+export const backendSetSharedState = (key, nextState) => ({
+  type: 'backend/setSharedState',
+  payload: { key, nextState },
+});
+
 export const backendReducer = (state, action) => {
   const { type, payload } = action;
 
-  if (type === 'backendUpdate') {
+  if (type === 'backend/update') {
     // Merge config
     const config = {
       ...state.config,
@@ -36,6 +35,19 @@ export const backendReducer = (state, action) => {
       ...payload.static_data,
       ...payload.data,
     };
+    // Merge shared states
+    const shared = { ...state.shared };
+    if (payload.shared) {
+      for (let key of Object.keys(payload.shared)) {
+        const value = payload.shared[key];
+        if (value === '') {
+          shared[key] = undefined;
+        }
+        else {
+          shared[key] = JSON.parse(value);
+        }
+      }
+    }
     // Calculate our own fields
     const visible = config.status !== UI_DISABLED;
     const interactive = config.status === UI_INTERACTIVE;
@@ -44,11 +56,23 @@ export const backendReducer = (state, action) => {
       ...state,
       config,
       data,
+      shared,
       visible,
       interactive,
     };
   }
 
+  if (type === 'backend/setSharedState') {
+    const { key, nextState } = payload;
+    return {
+      ...state,
+      shared: {
+        ...state.shared,
+        [key]: nextState,
+      },
+    };
+  }
+
   return state;
 };
 
@@ -84,15 +108,78 @@ export const backendReducer = (state, action) => {
  * }}
  */
 export const useBackend = context => {
-  // TODO: Dispatch "act" calls as Redux actions
   const { store } = context;
   const state = store.getState();
   const ref = state.config.ref;
-  const boundAct = (action, params = {}) => {
-    act(ref, action, params);
-  };
-  return {
-    ...state,
-    act: boundAct,
+  const act = (action, params = {}) => {
+    callByond('', {
+      src: ref,
+      action,
+      ...params,
+    });
   };
+  return { ...state, act };
+};
+
+/**
+ * Allocates state on Redux store without sharing it with other clients.
+ *
+ * Use it when you want to have a stateful variable in your component
+ * that persists between renders, but will be forgotten after you close
+ * the UI.
+ *
+ * It is a lot more performant than `setSharedState`.
+ *
+ * @param {any} context React context.
+ * @param {string} key Key which uniquely identifies this state in Redux store.
+ * @param {any} initialState Initializes your global variable with this value.
+ */
+export const useLocalState = (context, key, initialState) => {
+  const { store } = context;
+  const state = store.getState();
+  const sharedStates = state.shared ?? {};
+  const sharedState = (key in sharedStates)
+    ? sharedStates[key]
+    : initialState;
+  return [
+    sharedState,
+    nextState => {
+      store.dispatch(backendSetSharedState(key, nextState));
+    },
+  ];
+};
+
+/**
+ * Allocates state on Redux store, and **shares** it with other clients
+ * in the game.
+ *
+ * Use it when you want to have a stateful variable in your component
+ * that persists not only between renders, but also gets pushed to other
+ * clients that observe this UI.
+ *
+ * This makes creation of observable s
+ *
+ * @param {any} context React context.
+ * @param {string} key Key which uniquely identifies this state in Redux store.
+ * @param {any} initialState Initializes your global variable with this value.
+ */
+export const useSharedState = (context, key, initialState) => {
+  const { store } = context;
+  const state = store.getState();
+  const ref = state.config.ref;
+  const sharedStates = state.shared ?? {};
+  const sharedState = (key in sharedStates)
+    ? sharedStates[key]
+    : initialState;
+  return [
+    sharedState,
+    nextState => {
+      callByond('', {
+        src: ref,
+        action: 'tgui:setSharedState',
+        key,
+        value: JSON.stringify(nextState) || '',
+      });
+    },
+  ];
 };
diff --git a/tgui/packages/tgui/byond.js b/tgui/packages/tgui/byond.js
index 56a407e6042..dc4e681bf10 100644
--- a/tgui/packages/tgui/byond.js
+++ b/tgui/packages/tgui/byond.js
@@ -1,12 +1,12 @@
-import { buildQueryString } from 'common/string';
+// Reference a global Byond object
+const { Byond } = window;
 
 /**
  * Version of Trident engine used in Internet Explorer.
+ * An integer number or `null` if this is not a trident engine.
  *
  * - IE 8 - Trident 4.0
  * - IE 11 - Trident 7.0
- *
- * @return An integer number or 'null' if this is not a trident engine.
  */
 const tridentVersion = (() => {
   const groups = navigator.userAgent.match(/Trident\/(\d+).+?;/i);
@@ -27,41 +27,23 @@ export const IS_IE8 = tridentVersion !== null
   && tridentVersion <= 4;
 
 /**
- * True if browser is a BYOND browser.
+ * Makes a BYOND call.
+ *
+ * If path is empty, this will trigger a Topic call.
+ * You can reference a specific object by setting the "src" parameter.
+ *
+ * See: https://secure.byond.com/docs/ref/skinparams.html
  */
-// We're currently just checking, whether we're running on a localhost
-// with a path similar to a BYOND cache. I couldn't find a better/faster
-// non-invasive method of doing this.
-export const IS_BYOND = tridentVersion !== null
-  && location.hostname === '127.0.0.1'
-  && location.pathname.startsWith('/tmp');
-
-/**
- * Helper to generate a BYOND href given 'params' as an object
- * (with an optional 'url' for eg winset).
- */
-const createByondUrl = (path, params = {}) => {
-  return 'byond://' + path + '?' + buildQueryString(params);
-};
-
 export const callByond = (path, params = {}) => {
-  // Abort BYOND calls when we're running in a normal browser
-  if (!IS_BYOND) {
-    return;
-  }
-  location.href = createByondUrl(path, params);
+  Byond.call(path, params);
 };
 
 /**
- * A high-level abstraction of BYJAX. Makes a call to BYOND and returns
+ * A high-level abstraction of BYOND calls. Makes a BYOND call and returns
  * a promise, which (if endpoint has a callback parameter) resolves
  * with the return value of that call.
  */
 export const callByondAsync = (path, params = {}) => {
-  // Abort BYOND calls when we're running in a normal browser
-  if (!IS_BYOND) {
-    return new Promise(() => {});
-  }
   // Create a callback array if it doesn't exist yet
   window.__callbacks__ = window.__callbacks__ || [];
   // Create a Promise and push its resolve function into callback array
@@ -71,7 +53,7 @@ export const callByondAsync = (path, params = {}) => {
     window.__callbacks__.push(resolve);
   });
   // Call BYOND client
-  callByond(path, {
+  Byond.call(path, {
     ...params,
     callback: `__callbacks__[${callbackIndex}]`,
   });
@@ -79,18 +61,12 @@ export const callByondAsync = (path, params = {}) => {
 };
 
 /**
- * Literally types a command on the client.
+ * Runs a BYOND skin command
+ *
+ * See: https://secure.byond.com/docs/ref/skinparams.html
  */
 export const runCommand = command => callByond('winset', { command });
 
-/**
- * Helper to make a BYOND ui_act() call on the UI 'src' given an 'action'
- * and optional 'params'.
- */
-export const act = (src, action, params = {}) => {
-  return callByond('', { src, action, ...params });
-};
-
 /**
  * Calls 'winget' on a BYOND skin element, retrieving value by the 'key'.
  */
diff --git a/tgui/packages/tgui/index.js b/tgui/packages/tgui/index.js
index 818158f0958..645d8691a0b 100644
--- a/tgui/packages/tgui/index.js
+++ b/tgui/packages/tgui/index.js
@@ -11,15 +11,12 @@ import { setupHotReloading } from 'tgui-dev-server/link/client';
 import { backendUpdate } from './backend';
 import { IS_IE8 } from './byond';
 import { setupDrag } from './drag';
-import { createLogger } from './logging';
+import { logger } from './logging';
 import { createStore, StoreProvider } from './store';
 
 const enteredBundleAt = Date.now();
-
-const logger = createLogger();
 const store = createStore();
 let reactRoot;
-
 let initialRender = true;
 
 const renderLayout = () => {
@@ -117,7 +114,7 @@ const setupApp = () => {
   // Subscribe for bankend updates
   window.update = stateJson => {
     // NOTE: stateJson can be an object only if called manually from console.
-    // This is useful for debugging tgui in proper browsers, like Chrome.
+    // This is useful for debugging tgui in external browsers, like Chrome.
     const state = typeof stateJson === 'string'
       ? parseStateJson(stateJson)
       : stateJson;
diff --git a/tgui/packages/tgui/interfaces/AirAlarm.js b/tgui/packages/tgui/interfaces/AirAlarm.js
index 5d5755ba067..c6f440985aa 100644
--- a/tgui/packages/tgui/interfaces/AirAlarm.js
+++ b/tgui/packages/tgui/interfaces/AirAlarm.js
@@ -1,7 +1,7 @@
 import { toFixed } from 'common/math';
 import { decodeHtmlEntities } from 'common/string';
 import { Fragment } from 'inferno';
-import { useBackend } from '../backend';
+import { useBackend, useLocalState } from '../backend';
 import { Box, Button, LabeledList, NumberInput, Section } from '../components';
 import { getGasLabel } from '../constants';
 import { Window } from '../layouts';
@@ -114,19 +114,17 @@ const AIR_ALARM_ROUTES = {
 };
 
 const AirAlarmControl = (props, context) => {
-  const { act, config } = useBackend(context);
-  const route = AIR_ALARM_ROUTES[config.screen] || AIR_ALARM_ROUTES.home;
+  const [screen, setScreen] = useLocalState(context, 'screen');
+  const route = AIR_ALARM_ROUTES[screen] || AIR_ALARM_ROUTES.home;
   const Component = route.component();
   return (
     <Section
       title={route.title}
-      buttons={config.screen !== 'home' && (
+      buttons={screen && (
         <Button
           icon="arrow-left"
           content="Back"
-          onClick={() => act('tgui:view', {
-            screen: 'home',
-          })} />
+          onClick={() => setScreen()} />
       )}>
       <Component />
     </Section>
@@ -139,6 +137,7 @@ const AirAlarmControl = (props, context) => {
 
 const AirAlarmControlHome = (props, context) => {
   const { act, data } = useBackend(context);
+  const [screen, setScreen] = useLocalState(context, 'screen');
   const {
     mode,
     atmos_alarm,
@@ -166,30 +165,22 @@ const AirAlarmControlHome = (props, context) => {
       <Button
         icon="sign-out-alt"
         content="Vent Controls"
-        onClick={() => act('tgui:view', {
-          screen: 'vents',
-        })} />
+        onClick={() => setScreen('vents')} />
       <Box mt={1} />
       <Button
         icon="filter"
         content="Scrubber Controls"
-        onClick={() => act('tgui:view', {
-          screen: 'scrubbers',
-        })} />
+        onClick={() => setScreen('scrubbers')} />
       <Box mt={1} />
       <Button
         icon="cog"
         content="Operating Mode"
-        onClick={() => act('tgui:view', {
-          screen: 'modes',
-        })} />
+        onClick={() => setScreen('modes')} />
       <Box mt={1} />
       <Button
         icon="chart-bar"
         content="Alarm Thresholds"
-        onClick={() => act('tgui:view', {
-          screen: 'thresholds',
-        })} />
+        onClick={() => setScreen('thresholds')} />
     </Fragment>
   );
 };
diff --git a/tgui/packages/tgui/interfaces/CameraConsole.js b/tgui/packages/tgui/interfaces/CameraConsole.js
index eb9513888e2..594de52eb2c 100644
--- a/tgui/packages/tgui/interfaces/CameraConsole.js
+++ b/tgui/packages/tgui/interfaces/CameraConsole.js
@@ -3,10 +3,9 @@ import { flow } from 'common/fp';
 import { classes } from 'common/react';
 import { createSearch } from 'common/string';
 import { Fragment } from 'inferno';
-import { useBackend } from '../backend';
+import { useBackend, useLocalState } from '../backend';
 import { Button, ByondUi, Input, Section } from '../components';
 import { refocusLayout, Window } from '../layouts';
-import { useGlobal } from '../store';
 
 /**
  * Returns previous and next camera names relative to the currently
@@ -95,7 +94,7 @@ export const CameraConsoleContent = (props, context) => {
   const [
     searchText,
     setSearchText,
-  ] = useGlobal(context, 'searchText', '');
+  ] = useLocalState(context, 'searchText', '');
   const { activeCamera } = data;
   const cameras = selectCameras(data.cameras, searchText);
   return (
diff --git a/tgui/packages/tgui/interfaces/Cargo.js b/tgui/packages/tgui/interfaces/Cargo.js
index 8fdc9abee23..fa29c30c11f 100644
--- a/tgui/packages/tgui/interfaces/Cargo.js
+++ b/tgui/packages/tgui/interfaces/Cargo.js
@@ -1,13 +1,12 @@
 import { toArray } from 'common/collections';
 import { Fragment } from 'inferno';
-import { useBackend } from '../backend';
+import { useBackend, useSharedState } from '../backend';
 import { AnimatedNumber, Box, Button, Divider, Flex, LabeledList, Section, Table } from '../components';
 import { Window } from '../layouts';
-import { useGlobal } from '../store';
 
 export const Cargo = (props, context) => {
   const { act, data } = useBackend(context);
-  const [tab, setTab] = useGlobal(context, 'tab', 'catalog');
+  const [tab, setTab] = useSharedState(context, 'tab', 'catalog');
   const {
     requestonly,
   } = data;
@@ -125,7 +124,7 @@ export const CargoCatalog = (props, context) => {
   const [
     activeSupplyName,
     setActiveSupplyName,
-  ] = useGlobal(context, 'supply', supplies[0]?.name);
+  ] = useSharedState(context, 'supply', supplies[0]?.name);
   const activeSupply = supplies.find(supply => {
     return supply.name === activeSupplyName;
   });
diff --git a/tgui/packages/tgui/interfaces/CargoExpress.js b/tgui/packages/tgui/interfaces/CargoExpress.js
index d020a0ce2ee..4e4ccf6a881 100644
--- a/tgui/packages/tgui/interfaces/CargoExpress.js
+++ b/tgui/packages/tgui/interfaces/CargoExpress.js
@@ -1,9 +1,9 @@
-import { AnimatedNumber, Section, LabeledList, Button, Box } from "../components";
-import { Fragment } from "inferno";
-import { InterfaceLockNoticeBox } from "./common/InterfaceLockNoticeBox";
-import { CargoCatalog } from "./Cargo";
-import { useBackend } from "../backend";
-import { Window } from "../layouts";
+import { Fragment } from 'inferno';
+import { useBackend } from '../backend';
+import { AnimatedNumber, Box, Button, LabeledList, Section } from '../components';
+import { Window } from '../layouts';
+import { CargoCatalog } from './Cargo';
+import { InterfaceLockNoticeBox } from './common/InterfaceLockNoticeBox';
 
 export const CargoExpress = (props, context) => {
   const { act, data } = useBackend(context);
diff --git a/tgui/packages/tgui/interfaces/ChemFilter.js b/tgui/packages/tgui/interfaces/ChemFilter.js
index 8a1ed2ea0d2..2b5bd059dbb 100644
--- a/tgui/packages/tgui/interfaces/ChemFilter.js
+++ b/tgui/packages/tgui/interfaces/ChemFilter.js
@@ -1,8 +1,7 @@
 import { Fragment } from 'inferno';
-import { useBackend } from '../backend';
+import { useBackend, useLocalState } from '../backend';
 import { Button, Flex, Input, Section } from '../components';
 import { Window } from '../layouts';
-import { useGlobal } from '../store';
 
 export const ChemFilterPane = (props, context) => {
   const { act } = useBackend(context);
@@ -48,8 +47,8 @@ export const ChemFilter = (props, context) => {
     left = [],
     right = [],
   } = data;
-  const [leftName, setLeftName] = useGlobal(context, 'leftName', '');
-  const [rightName, setRightName] = useGlobal(context, 'rightName', '');
+  const [leftName, setLeftName] = useLocalState(context, 'leftName', '');
+  const [rightName, setRightName] = useLocalState(context, 'rightName', '');
   return (
     <Window resizable>
       <Window.Content scrollable>
diff --git a/tgui/packages/tgui/interfaces/ChemMaster.js b/tgui/packages/tgui/interfaces/ChemMaster.js
index 5dd0a1ab69e..880329b294d 100644
--- a/tgui/packages/tgui/interfaces/ChemMaster.js
+++ b/tgui/packages/tgui/interfaces/ChemMaster.js
@@ -1,8 +1,7 @@
 import { Fragment } from 'inferno';
-import { useBackend } from '../backend';
+import { useBackend, useSharedState } from '../backend';
 import { AnimatedNumber, Box, Button, ColorBox, LabeledList, NumberInput, Section, Table } from '../components';
 import { Window } from '../layouts';
-import { useGlobal } from '../store';
 
 export const ChemMaster = (props, context) => {
   const { data } = useBackend(context);
@@ -221,19 +220,19 @@ const PackagingControls = (props, context) => {
   const [
     pillAmount,
     setPillAmount,
-  ] = useGlobal(context, 'pillAmount', 1);
+  ] = useSharedState(context, 'pillAmount', 1);
   const [
     patchAmount,
     setPatchAmount,
-  ] = useGlobal(context, 'patchAmount', 1);
+  ] = useSharedState(context, 'patchAmount', 1);
   const [
     bottleAmount,
     setBottleAmount,
-  ] = useGlobal(context, 'bottleAmount', 1);
+  ] = useSharedState(context, 'bottleAmount', 1);
   const [
     packAmount,
     setPackAmount,
-  ] = useGlobal(context, 'packAmount', 1);
+  ] = useSharedState(context, 'packAmount', 1);
   const {
     condi,
     chosenPillStyle,
diff --git a/tgui/packages/tgui/interfaces/ChemReactionChamber.js b/tgui/packages/tgui/interfaces/ChemReactionChamber.js
index b18603d5741..9af7ef7ddbd 100644
--- a/tgui/packages/tgui/interfaces/ChemReactionChamber.js
+++ b/tgui/packages/tgui/interfaces/ChemReactionChamber.js
@@ -1,20 +1,19 @@
 import { map } from 'common/collections';
 import { classes } from 'common/react';
-import { useBackend } from '../backend';
+import { useBackend, useLocalState } from '../backend';
 import { Box, Button, Input, LabeledList, NumberInput, Section } from '../components';
 import { Window } from '../layouts';
-import { useGlobal } from '../store';
 
 export const ChemReactionChamber = (props, context) => {
   const { act, data } = useBackend(context);
   const [
     reagentName,
     setReagentName,
-  ] = useGlobal(context, 'reagentName', '');
+  ] = useLocalState(context, 'reagentName', '');
   const [
     reagentQuantity,
     setReagentQuantity,
-  ] = useGlobal(context, 'reagentQuantity', 1);
+  ] = useLocalState(context, 'reagentQuantity', 1);
   const emptying = data.emptying;
   const reagents = data.reagents || [];
   return (
diff --git a/tgui/packages/tgui/interfaces/KitchenSink.js b/tgui/packages/tgui/interfaces/KitchenSink.js
index 2a633a7a783..ad612d77d34 100644
--- a/tgui/packages/tgui/interfaces/KitchenSink.js
+++ b/tgui/packages/tgui/interfaces/KitchenSink.js
@@ -1,9 +1,8 @@
 import { Component } from 'inferno';
-import { useBackend } from '../backend';
+import { useBackend, useLocalState } from '../backend';
 import { BlockQuote, Box, Button, ByondUi, Collapsible, Icon, Input, Knob, LabeledList, NumberInput, ProgressBar, Section, Slider, Tabs, Tooltip } from '../components';
 import { DraggableControl } from '../components/DraggableControl';
 import { Window } from '../layouts';
-import { useGlobal } from '../store';
 
 const COLORS_ARBITRARY = [
   'red',
@@ -72,7 +71,7 @@ const PAGES = [
 ];
 
 export const KitchenSink = (props, context) => {
-  const [theme] = useGlobal(context, 'kitchenSinkTheme');
+  const [theme] = useLocalState(context, 'kitchenSinkTheme');
   return (
     <Window
       theme={theme}
@@ -470,7 +469,7 @@ const KitchenSinkByondUi = (props, context) => {
 };
 
 const KitchenSinkThemes = (props, context) => {
-  const [theme, setTheme] = useGlobal(context, 'kitchenSinkTheme');
+  const [theme, setTheme] = useLocalState(context, 'kitchenSinkTheme');
   return (
     <Box>
       <LabeledList>
diff --git a/tgui/packages/tgui/interfaces/MalfunctionModulePicker.js b/tgui/packages/tgui/interfaces/MalfunctionModulePicker.js
index 7a2b531630f..b40f35f69dc 100644
--- a/tgui/packages/tgui/interfaces/MalfunctionModulePicker.js
+++ b/tgui/packages/tgui/interfaces/MalfunctionModulePicker.js
@@ -1,9 +1,8 @@
 import { createSearch, decodeHtmlEntities } from 'common/string';
 import { Fragment } from 'inferno';
-import { useBackend } from '../backend';
+import { useBackend, useLocalState } from '../backend';
 import { Box, Button, Input, Section, Table, Tabs } from '../components';
 import { Window } from '../layouts';
-import { useGlobal } from '../store';
 
 const MAX_SEARCH_RESULTS = 25;
 
@@ -17,11 +16,11 @@ export const MalfunctionModulePicker = (props, context) => {
   const [
     hoveredItem,
     setHoveredItem,
-  ] = useGlobal(context, 'hoveredItem', {});
+  ] = useLocalState(context, 'hoveredItem', {});
   const [
     searchText,
     setSearchText,
-  ] = useGlobal(context, 'searchText', '');
+  ] = useLocalState(context, 'searchText', '');
   const testSearch = createSearch(searchText, item => {
     return item.name + item.desc;
   });
diff --git a/tgui/packages/tgui/interfaces/Uplink.js b/tgui/packages/tgui/interfaces/Uplink.js
index 939fe914181..bbf87cec823 100644
--- a/tgui/packages/tgui/interfaces/Uplink.js
+++ b/tgui/packages/tgui/interfaces/Uplink.js
@@ -1,9 +1,8 @@
 import { createSearch, decodeHtmlEntities } from 'common/string';
 import { Fragment } from 'inferno';
-import { useBackend } from '../backend';
+import { useBackend, useLocalState } from '../backend';
 import { Box, Button, Input, Section, Table, Tabs } from '../components';
 import { Window } from '../layouts';
-import { useGlobal } from '../store';
 
 const MAX_SEARCH_RESULTS = 25;
 
@@ -18,11 +17,11 @@ export const Uplink = (props, context) => {
   const [
     hoveredItem,
     setHoveredItem,
-  ] = useGlobal(context, 'hoveredItem', {});
+  ] = useLocalState(context, 'hoveredItem', {});
   const [
     searchText,
     setSearchText,
-  ] = useGlobal(context, 'searchText', '');
+  ] = useLocalState(context, 'searchText', '');
   const testSearch = createSearch(searchText, item => {
     return item.name + item.desc;
   });
diff --git a/tgui/packages/tgui/logging.js b/tgui/packages/tgui/logging.js
index 9a886266fbf..c3a23306503 100644
--- a/tgui/packages/tgui/logging.js
+++ b/tgui/packages/tgui/logging.js
@@ -1,5 +1,5 @@
 import { sendLogEntry } from 'tgui-dev-server/link/client';
-import { act } from './byond';
+import { callByond } from './byond';
 
 const LEVEL_DEBUG = 0;
 const LEVEL_LOG = 1;
@@ -27,7 +27,9 @@ const log = (level, ns, ...args) => {
       .filter(value => value)
       .join(' ')
       + '\nUser Agent: ' + navigator.userAgent;
-    act(window.__ref__, 'tgui:log', {
+    callByond({
+      src: window.__ref__,
+      action: 'tgui:log',
       log: logEntry,
     });
   }
diff --git a/tgui/packages/tgui/public/tgui.html b/tgui/packages/tgui/public/tgui.html
index cb363a98c55..e16b6765892 100644
--- a/tgui/packages/tgui/public/tgui.html
+++ b/tgui/packages/tgui/public/tgui.html
@@ -19,6 +19,53 @@ window.__ref__ = document
 if (window.__ref__ === '[' + 'tgui:ref' + ']') {
   window.__ref__ = null;
 }
+// BYOND API object
+window.Byond = (function () {
+  var Byond = {};
+  // Utility functions
+  var hasOwn = Object.prototype.hasOwnProperty;
+  // Basic checks to detect whether this page runs in BYOND
+  var isByond = !!navigator.userAgent.match(/Trident\/(\d+).+?;/i)
+    && location.hostname === '127.0.0.1'
+    && location.pathname.indexOf('/tmp') === 0;
+  // Makes a BYOND call.
+  // See: https://secure.byond.com/docs/ref/skinparams.html
+  Byond.call = function (path, params) {
+    // Not running in BYOND, abort.
+    if (!isByond) {
+      return;
+    }
+    // Build the URL
+    var url = (path || '') + '?';
+    var i = 0;
+    if (params) {
+      for (var key in params) {
+        if (hasOwn.call(params, key)) {
+          if (i++ > 0) {
+            url += '&';
+          }
+          var value = params[key];
+          if (value === null || value === undefined) {
+            value = '';
+          }
+          url += encodeURIComponent(key)
+            + '=' + encodeURIComponent(value)
+        }
+      }
+    }
+    // Perform a standard call via location.href
+    if (url.length < 2048) {
+      location.href = 'byond://' + url;
+      return;
+    }
+    // Send an HTTP request to DreamSeeker's HTTP server.
+    // Allows sending much bigger payloads.
+    var xhr = new XMLHttpRequest();
+    xhr.open('GET', url);
+    xhr.send();
+  };
+  return Byond;
+})();
 // Global error handling
 window.onerror = function (msg, url, line, col, error) {
   // Proper stacktrace
@@ -44,10 +91,13 @@ window.onerror = function (msg, url, line, col, error) {
       errorStack.textContent = stack;
     }
   }
-  // Send to the backend
-  location.href = 'byond://?src=' + window.__ref__
-    + '&action=tgui:log&fatal=1'
-    + '&log=' + encodeURIComponent(stack);
+  // Send logs to the server
+  Byond.call('', {
+    src: window.__ref__,
+    action: 'tgui:log',
+    fatal: '1',
+    log: stack,
+  });
   // Short-circuit further updates
   window.__updateQueue__ = [];
   window.update = function () {};
@@ -59,8 +109,10 @@ window.__updateQueue__ = [];
 window.update = function (stateJson) {
   window.__updateQueue__.push(stateJson);
 };
-location.href = 'byond://?src=' + window.__ref__
-  + '&action=tgui:initialize';
+Byond.call('', {
+  src: window.__ref__,
+  action: 'tgui:initialize',
+});
 </script>
 
 <!-- Styles -->
diff --git a/tgui/packages/tgui/store.js b/tgui/packages/tgui/store.js
index a0cc9eb72c7..a9e5ffb179c 100644
--- a/tgui/packages/tgui/store.js
+++ b/tgui/packages/tgui/store.js
@@ -11,7 +11,6 @@ export const createStore = () => {
     // Global state reducers
     backendReducer,
     hotKeyReducer,
-    globalStateReducer,
   ]);
   const middleware = [
     // loggingMiddleware,
@@ -34,47 +33,3 @@ export class StoreProvider extends Component {
 export const useDispatch = context => {
   return context.store.dispatch;
 };
-
-/**
- * Allocates a global variable on Redux store.
- *
- * Great when you want to store some UI state globally, without having to
- * modify DM object you're working with to have that var and export it via
- * ui_data.
- *
- * @param {any} context React context.
- * @param {string} key Key which uniquely identifies this state in Redux store.
- * @param {any} initialState Initializes your global variable with this value.
- */
-export const useGlobal = (context, key, initialState) => {
-  const { store } = context;
-  const globalObj = store.getState().global ?? {};
-  const state = (key in globalObj)
-    ? globalObj[key]
-    : initialState;
-  const setState = nextState => {
-    store.dispatch({
-      type: 'setGlobal',
-      payload: { key, nextState },
-    });
-  };
-  return [state, setState];
-};
-
-/**
- * Reducer, which handles actions coming from useGlobal.
- */
-const globalStateReducer = (state, action) => {
-  const { type, payload } = action;
-  if (type === 'setGlobal') {
-    const { key, nextState } = payload;
-    return {
-      ...state,
-      global: {
-        ...state.global,
-        [key]: nextState,
-      },
-    };
-  }
-  return state;
-};