Just uses Login()

code/modules/mob/living/login.dm

@@ -18,6 +18,10 @@
 			if("nuclear emergency")
 				if(mind in ticker.mode:syndicates)
 					ticker.mode.update_all_synd_icons()
+
+	if(ventcrawler)
+		src << "<span class='notice'>You can ventcrawl! Use alt+click on vents to quickly travel about the station.</span>"
+
 	return .
 
 //This stuff needs to be merged from cloning.dm but I'm not in the mood to be shouted at for breaking all the things :< ~Carn