Newbie question: how to tell if inside the IDE

[peter9.smith at ps.ge.com]

Sorry but I couldn't find anything in the archives or documentation -
probably not knowing what to look for.

I've just rendered a fortunately throwaway stack uneditable by causing the
preopenstack handler to always execute quit.  How can I tell inside
Transcript if I'm running inside the IDE?

Thanks for advice on this first of many questions, Peter Smith.