this is from Virtual PC 2004 Help
**Using the keyboard and mouse in a virtual machine**
Key combination Description
Host key+L Restores Virtual PC Console from a minimized state. Moves Virtual PC Console to the foreground.
Host key+I Installs Virtual Machine Additions.
Host key+ENTER Toggles a virtual machine between full-screen mode and window mode.
Host key+DELETE Sends CTRL+ALT+DELETE to the virtual machine operating system.
Host key+P Pauses or resumes the virtual machine, depending upon its current state.
Host key+R Resets the virtual machine.
Host key+F4 Closes the virtual machine.
Host key+C Copies the selected items.
Host key+V Pastes a copied item.
Host key+A Selects all.
Host key+E Opens the virtual machine settings.
Host key+DOWN ARROW Minimizes the virtual machine.
Host key+LEFT ARROW Switches to the previous virtual machine when running multiple virtual machines, unless you are using
Host key+RIGHT ARROW Switches to the next virtual machine when running multiple virtual machines, unless you are using