Transferring files between XP and Vista in Parallels

I have a MBP and I've already got an XP vm setup and working properly. However, I also need to run Vista and will be installing Vista Ultimate in another vm. My question is, if both are running and setup to use a workgroup network, will I be able to copy from XP to Vista while they are both running?

I have about 10 gigs of data that I need to have in both vm's. The data is currently on an older MBP, but I was hoping I could just copy from XP to Vista once both vm's are setup.

I installed 4 gigs of RAM so I could dedicate 1 gig to XP, 2 gigs to Vista and still have 1 gigs for OS X.

If this works, it will be my dream machine because I can run all the OS's that I need on one computer.