Let's say I work on a file at home. I put this file on iDisk. I go to work the next day. I get on iDisk for the file and do some editing. When I go back home, does iDisk update the file with my changes? Also, how do I put the iDisk icon on my desktop (PC at work and PC at home) like I see in the video? It automatically shows up on my macbook (strange icon to say the least).