Tabs: module{	PATH:	con "/dis/lib/tabs.dis"; 	init:	fn(); 	mktabs:		fn(t: ref Tk->Toplevel, dot: string,				tabs: array of (string, string),				dflt: int): chan of string; 	tabsctl:	fn(t: ref Tk->Toplevel,				dot: string,				tabs: array of (string, string),				id: int,				s: string): int;};