in reply to running an external program without waiting for its execution

To carry on the theme of TMTOWTDI ...

If you're running under Win32 (which you probably aren't) then one of the best ways of doing this kind of thing is to use the Win32::Process module. You can fire off a task as a DETACHED_PROCESS and then forget about it. Useful if you don't have a decent fork but not even remotely portable.
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Ugly
The early bird gets the worm, but the second mouse gets the cheese.

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