This answer is probably way too belated - you can fork after your MainLoop in Tk as long as you use CORE::exit to exit the child instead of plain exit. Turns out that Tk overrides it.

{NULE}
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In reply to Re: forking in Tk and letting the dad alone deal with X stuff by {NULE}
in thread forking in Tk and letting the dad alone deal with X stuff by stefp

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