Mark, I routinely run TR on two 2.53 machines. No problem. I run TR in a window under WIN2000Pro for SSB, but most often run TR on a P3/1Ghz machine in a window under WIN98SE for CW since WIN2000/XP won't give up control of the I/O for fluent CW. Jon Hamlet, W4ZW Casey Key Island, FL "A little piece of paradise in the Gulf of Mexico"