Hi all, I've got an intel iMac I use as my main computer. From time to time I also need to work off of a MacBook, which is someone else's main computer. Here's what I want to do: - Use the MacBook by booting off of a bus-powered drive, and - Have the moved/changed/new/deleted stuff during that session accurately sync back to my iMac whenever I hook the external back into 'home base.' Ideally, I'd like to do this while the iMac is running (i.e. not having to boot from the external, sync to iMac, then boot the iMac). My question is: what software would provide this functionality in the most trouble-free manner?