Tk_MainWindow (3) - Linux Manuals
Tk_MainWindow: functions for querying main
Tk_MainWindow, Tk_GetNumMainWindows - functions for querying main window information
#include <tk.h> Tk_Window Tk_MainWindow(interp) int Tk_GetNumMainWindows()
Tcl_Interp *interp (in/out)
Interpreter associated with the application.
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.
KEYWORDSapplication, main window