I'm clearly in over my head here, but I'm hoping macruby can simplify some complexity. I've cobbled together an objective c framework with a class that handles some IO Kit transactions. The framework seems to work with objective c cocoa applications. I would like to use this framework from macirb or a simple standalone ruby script. The framework appears to load from macirb and I can make an object and call it's methods. I can see packets sent out the FireWire port as expected. A key feature of the framework is accepting callbacks from IO kit. Certain FireWire packets on the bus should invoke method callbacks. The callbacks do not seem to make it to the objects created in macirb or a simple script. I'm researching run loops and threads and trying to understand if macirb or macruby uses NSApplication and its run loop, but I'm not getting very far and I may be way off base. Any advice or insight is appreciated. Hopefully I'm missing something simple, but if what I'm trying to achieve is extremly difficult or impossible it would be good to know that also. Regards, Barry