There is a Unix utility called lsof available at http://www.geeklair.net/downloads/ which can help... But the last time I looked at it, it was not really newbie friendly. Robert Sandilands --- #include http://rsandila.webhop.org/disclaimer.html >Yes, I could do this brute force next time it happens, but I was hoping >there was a smart way to do it. Obviously the OS knows which app is causing >the problem - is there a way for it to tell me, so I can fix it without >interrupting my work by quitting 25 applications? Also, the culprit could >be some kind of background process. >Jerry