Thanks - this helps.

I had read the FAQ but wasn't certain what to think after reading the plugin question. The library I have in mind definitely doesn't call back into the main app (as the faq answer says) and they share data structures only in the sense of the library taking parameters.. not sharing in the shared memory sense of both accessing an in-memory structure being maintained by the program. Quite a gray area.. but it does seem clear as to the intent now. Thanks for the sanity check!