Quits the program or the current batch script.

EXIT [/B] [exitCode]

  /B		specifies to exit the current batch script instead of
		the program. If executed from outside a batch script,
		it will quit the program.

  exitCode	specifies a numeric number.  if /B is specified, sets
		ERRORLEVEL that number.  If quitting program, sets the process
		exit code with that number.
