I have a button (Perl/Tk) that, ideally, will halt the process, and when clicked again it continues the process.

You may find this post by BrowserUk to be useful:

Re^3: Tk and Threads

— it shows how a button can be used to pause and resume a thread.

Hope that helps,

Athanasius <°(((>< contra mundum Iustus alius egestas vitae, eros Piratica,

In reply to Re^3: Breaking from a foreach loop, returning to position by Athanasius
in thread Breaking from a foreach loop, returning to position by Anonymous Monk

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