VMware Workstation 5.5Features | Documentation | Knowledge Base | Discussion Forums
The Hot Key tab lets you change the key combination that determines whether certain combinations of keys are passed to the guest operating system or intercepted by VMware Workstation.
Note: Because Ctrl-Alt is the key combination used to tell VMware Workstation to release (ungrab) mouse and keyboard input, combinations that include Ctrl-Alt are not passed to the guest operating system. If you need to use such a combination for example, use Ctrl-Alt-<Fkey> to switch between Linux workspaces in a virtual machine press Ctrl-Alt-Space, release Space without releasing Ctrl and Alt, then press the third key of the key combination you want to send to the guest.
Using this dialog box, you can also construct your own custom hot-key combination.