I have bitten by this quite a few times before, so let me just share my experiences.

I tend to use POE::Wheel::Run. It may not work properly in Windows especially if you're inside a GUI loop.(WxWidgets, Tk, Win32,...) Still worth a try. It has a beautiful interface and in most cases it will not block your program.

Another solution I have applied in the past came from BrowserUK. This is using the notorious threads but BrowserUK transforms it into a true work of art:
http://www.perlmonks.org/?node_id=621127

In reply to Re: Unable to capture STDOUT from system command by Proclus
in thread Unable to capture STDOUT from system command by Greg_R

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