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- Tcl_Interp *interp (in/out)
- Interpreter associated with the 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 interpreter interp's result.
Tk_GetNumMainWindows returns a count of the number of main windows currently open in the current thread.application, main window
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