I once tried this a couple of years ago with Treo 600s and I could never seem to get it right - I always wound up with missing or duplicate addresses and calendar events.

Both of my 650s have the same Hot Sync ID and I am on a Mac with OSX 10.4 and I want to keep one master set of data accessible from each 650 and the desktop. There are apps around like Username and ChangeName that let one fiddle with User Names and Hot Sync IDs but I am not sure how they work or even if they would help with this problem.

Has anybody got something like this to work without screwing up data? Any ideas about what might work? I am sure tired of repairing messed up data!!!

Thanks for any help or suggestions.