What is it? Where is it documented? How do I register a handler for an application-specific high-level event and how do I send that event to fire the handler? Can I add other details to the event itself or do I need a separate queue for additional information?

In reply to Re^3: Tk programmatically monitor change in Listbox by jcb
in thread Tk (Tcl::Tk) programmatically monitor change in Listbox by IB2017

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