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Message: [QUOTE="Jürgen Exner, post: 4835189"] If by periodically you mean recurring in regular intervals, then the 'at' command (similar to 'cron' on Unix) is your friend. Or the Task Scheduler from the GUI. If you question is really about running (a set of) external programs which happen to be other Perl scripts from a given Perl script, then you may want to check out system() and/or qx(). If you are looking for parallel execution fork() and exec() would be the way to go (although there are other methods, too) jue [/QUOTE]