[Twisted-Python] Running a GUI application based on PyQt

Hi, I'm trying to use a simple application based in twisted.internet.Protocol with PyQt4. PyQt has its own way of dealing with events, I've tried to run the reactor in a thread, but it says it only can acquire SIGINT from the main thread :( I've tried the code posted in qt4reactor.py but it doesn't work. It fails telling that a reactor's been already installed. Is it possible to use PyQt4 (v.4.4) with twisted? Thanks Nahuel