osx man page for tk_getnummainwindows

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 asso-
       ciated 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)