Tk::exit - End the application
use Tk qw(exit); ... B<exit>?(I<returnCode>)?;
Terminate the process, returning returnCode to the system as the exit status. If returnCode isn't specified then it defaults to 0.
exit from code invoked via a Tk callback then this Tk version of
exit cleans up more reliably than using the perl
exit from a forked process will terminate both the child process and the parent process. As
Tk::exit is imported by default one should use
CORE::exit in the forked process instead.