Tk_MainLoop - loop for events until all windows are deleted
SYNOPSIS
#include <tk.h>Tk_MainLoop()
DESCRIPTION
Tk_MainLoop is a procedure that loops repeatedly calling
Tcl_DoOneEvent. It returns only when there are no applications
left in this process (i.e. no main windows exist anymore). Most
windowing applications will call Tk_MainLoop after
initialization; the main execution of the application will consist
entirely of callbacks invoked via Tcl_DoOneEvent.