Tk_MainLoop — loop for events until all windows are deleted
#include <tk.h>
Tk_MainLoop()
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.
application, event, main loop
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