I have a question that may very well be a bug or just a feature I don't understand fully: say I have two frame5s, each with an onChangeSelection link tag. If the frames are docked separately they both trigger properly, but if you superimpose one to the other (see attached image) only the currently focused frame will trigger the event.
I'm sure there is an easy workaround that can be achieved to update both frames (eg having the mtscript that's called call the other update as well), but, this doesn't seem like the intended behavior and I thought it was worth mentioning here.