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CentOS 7.0 - man page for tk_mainwindow (centos section 3)

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Tk_MainWindow(3)		      Tk Library Procedures			 Tk_MainWindow(3)

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NAME
       Tk_MainWindow, Tk_GetNumMainWindows - functions for querying main window information

SYNOPSIS
       #include <tk.h>

       Tk_Window
       Tk_MainWindow(interp)

       int
       Tk_GetNumMainWindows()

ARGUMENTS
       Tcl_Interp *interp (in/out)	  Interpreter associated with the application.
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DESCRIPTION
       A  main	window	is  a  special kind of toplevel window used as the outermost window in an
       application.

       If interp is associated with a Tk application then Tk_MainWindow returns the application's
       main  window.  If  there  is  no  Tk application associated with interp then Tk_MainWindow
       returns NULL and leaves an error message in interp->result.

       Tk_GetNumMainWindows returns a count of the number of main windows currently open  in  the
       process.

KEYWORDS
       application, main window

Tk					       7.0				 Tk_MainWindow(3)
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