About managing multiple virtual machines

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Consider the following when running more than one virtual machine in Microsoft Virtual PC:

Each virtual machine must have a unique name.
Additional memory is required when running more than one virtual machine at a time. For a more detailed discussion of memory usage, see About RAM memory settings.
A CD may be captured by more than one virtual machine at a time. When a CD is inserted into the CD drive of your Macintosh, the active virtual machine automatically captures the CD. You can make the CD available to other virtual machines by clicking Capture Disc on the Drives menu, or by clicking the CD icon on the Virtual PC toolbar.
A floppy disk or a floppy disk image can be captured by only one virtual machine at a time. The first virtual machine to capture the floppy disk or floppy disk image retains control of it until it is ejected or manually released by clicking Eject Floppy on the Drives menu, or until the virtual machine is shut down. Once a floppy disk or floppy disk image is released, it is available for use by your Macintosh or by another virtual machine.
A folder can be shared by more than one virtual machine at a time. Files within the folders can be modified by only one virtual machine at a time; however, files can be opened and read by multiple virtual machines.
Any device attached to a COM port can be used by only one virtual machine at a time. The device is not available to other virtual machines until it is manually released, or until the virtual machine is shut down.
Multiple virtual machines can use Shared Networking or Virtual Switch networking simultaneously.
A USB device can be used by only one virtual machine at a time. The device is not available to other virtual machines until it is manually released, or until the virtual machine is closed by using the Shut Down command (Shut down option).
The Macintosh Dock can contain the Start menu of only one virtual machine at a time.
Virtual PC supports drag-and-drop operations between Mac OS X and Microsoft Windows. It does not support drag-and-drop operations between two virtual machines. To transfer data from one virtual machine to another by using drag-and-drop operations, you must first drag the information to Mac OS X and then copy it to the virtual machine.