Here's two nifty recipies for using a debugger at rumtime:

At any arbitrary moment. Perhaps you've got some process that's long running and you occasionally want to stop it, examine its contents and then tell it to continue. Presumably you'd do the moral equivalent of Enbugger->unimport to remove the debugger.

$SIG{USR1} = \ &start_debugger;
sub start_debugger {
    require Enbugger;
    Enbugger->import;
}
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Start the debugger on exception.

Please share your ideas. You're smart people, I like using other smart people's ideas!