VirtualPC and clusters

It seems that MS Virutal PC doesn't permit the sharing of virtual-disks. This is kind of needed if one intends to simulate a cluster. Which I can't. I hear that the latest version of VMWare is the same way. The old VMWare still permits sharing of virtual-disks.

I wonder if it'd work if I had a pair of virtual disks that pointed to the same physical drive? But since I don't have a spare physical drive to dedicate to VPC use, I can't find out. Darnit.