the define

code/__DEFINES/tgui.dm

@@ -1,4 +1,28 @@
-#define UI_INTERACTIVE 2	// Green/Interactive
-#define UI_UPDATE 1			// Orange/Updates Only
-#define UI_DISABLED 0		// Red/Disabled
-#define UI_CLOSE -1			// Closed
+/// Green eye; fully interactive
+#define UI_INTERACTIVE 2
+/// Orange eye; updates but is not interactive
+#define UI_UPDATE 1
+/// Red eye; disabled, does not update
+#define UI_DISABLED 0
+/// UI Should close
+#define UI_CLOSE -1
+
+/// Maximum number of windows that can be suspended/reused
+#define TGUI_WINDOW_SOFT_LIMIT 5
+/// Maximum number of open windows
+#define TGUI_WINDOW_HARD_LIMIT 9
+
+/// Maximum ping timeout allowed to detect zombie windows
+#define TGUI_PING_TIMEOUT 4 SECONDS
+
+/// Window does not exist
+#define TGUI_WINDOW_CLOSED 0
+/// Window was just opened, but is still not ready to be sent data
+#define TGUI_WINDOW_LOADING 1
+/// Window is free and ready to receive data
+#define TGUI_WINDOW_READY 2
+
+/// Get a window id based on the provided pool index
+#define TGUI_WINDOW_ID(index) "tgui-window-[index]"
+/// Get a pool index of the provided window id
+#define TGUI_WINDOW_INDEX(window_id) text2num(copytext(window_id, 13))