Hi guys, I tried searching the archive 'cos I'm sure it was discussed - but the archive search engine is sick! I'm trying to simulate a bit of code but the control of the windows is constantly getting mixed up. If I try to single step in the code window the program memory window does the single stepping. This is not a huge problem when starting from a reset for the first time, but if I change to a modify window,async input window etc and then return to the code window to continue - the control reverts to the program memory eventhough the code window is highlighted. At this stage nothing short of exiting MPLAB will fix it. I'm using MPLAB 5.02 on NT4 but I also have the problem on another PC with win98. Any ideas for/pointers to a fix? John -- http://www.piclist.com hint: The PICList is archived three different ways. See http://www.piclist.com/#archives for details.