Copying myproject.doc Between Barney and Fred

Fred and Barney together do a little dance called the file transfer two-step, as numbered in the figure:

After this process is complete, both Barney and Fred have a copy of the file. However, if both keep working on their own copies of the file, merging the files back together can be a problem. So, although you can share files using file transfers, you need to be careful regarding who has "control" of the file at any one point in time.