> Yes, ok - but what about when I do want to raise a debugger from a
> non-UI process?  Is there some safe, accepted way to do that?

The following is pretty safe (no idea if it's "accepted" ;-)

    | process |
    process := Processor activeProcess.
    WorldState addDeferredUIMessage:[
        process debugWithTitle: 'Debug me!'.
    ].
    process suspend.

To try this just put it into a "[ ]fork".

Cheers,
  - Andreas