HI, I think we got enough security complexities for a while, so I'll torture you with a new topic 8) In GMS I've not only the engine serving request out of the GUI, but also the other way around. Like when the processing part detects a data flow which is a deadend, it will trigger an event in the GUI. I can imaging various other random events inside the VSH PL and BL that need to be passed to the DL and UI. I'm wondering if Loci allowes such abilities? Or should I put all the logic for handling the error\notify events inside the BL? It seems a good thing, and I'm willing to implement it, but I needs some feedback first ofcourse :) jarl