Ctrl+B

Power on the Virtual Machine

Ctrl+D

Edit the Virtual Machine Settings

Ctrl+E

Power off the Virtual Machine

Ctrl+G

Grab keyboard input focus

Ctrl+N

Create a new Virtual Machine

Ctrl+O

Open a Virtual Machine

Ctrl+P

Edit User Preferences

Ctrl+R

Reset Virtual Machine

Ctrl+Z

Suspend the Virtual Machine

Ctrl+F4

Close the Virtual Machine

Ctrl+Alt

Ungrab Input focus

Ctrl+Alt+Enter     

Switch to Full Screen Mode

Ctrl+Tab

Switch between ungrabbed virtual machines

Ctrl+Alt+Tab

Switch between virtual machines