Hi! When my plugin talks with chimera, it does so from a foreign thread. I am currently using an approach I have "stolen" from the DelphiViewer-plugin which fetches the see __init__.py>> self.parent = chimera.tkgui.app gui-thread and places a callback see __init__.py>> self.parent.after(100, self.CheckProcess) I have added a queue in between, so my extension feeds the queue, which the gui-thread is frequently asked to process (and empty) What I actually want to know is if there some kind of functionality like this already in chimera: The programmer of the DelphiViewer suspected something like that in the trigger-stuff __init__.py: # modify this to use the chimera.triggerSet? but I can not find any threading stuff there, just plain single-thread-callbacks......or am I wrong Thank for your help Lars