Instead Window widget in Xlib?

[Vahid Zahiri <v_zahiri yahoo com>]

 Hi

 I want make GUI for a application with GTK,
 
 i have a example for made GUI for this application
 with Xlib,in this example for view a graphical output
 of this application use "Window" widget.

 if i want rewrite this example with GTK,
 what is can use instead of Window(window,canvas,..)??
 
 Vahid

 Thanks very much

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