You might be able to use Inline to do this by opening a separate hidden window and forking off a thread to handle its messages (in C or C++). Incoming messages could then signal your main program. Inline works with Event, so you can define your own events and still be compatible with the Tk message loop.

update: just started playing with Event again, and it appears that Event isn't compatible with Tk, just with PerlQt. Anyway, the suggestion about the separate thread is still potentially useful.

In reply to Re: Window Messaging by bikeNomad
in thread Window Messaging by Stevo_ie

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