Search notes:

Oracle VirtualBox: Host key

Pressing the host key un-captures the keyboard (and the mouse?). (With a captured keyboard, all keyboard events, even alt/tab, go to the guest OS.
The default host key seems to be right-ctrl.

Assigning a host key

The currently assigned host key is shown in the in the bottom-right corner of the VM window:
The virtual key code of the host key can be displayed on the command line with 
VBoxManage.exe getextradata global GUI/Input/HostKeyCombination
The following PowerShell command assigns F12 as host key: 
VBoxManage.exe setextradata global GUI/Input/HostKeyCombination 123

Some keyboard shortcuts involving the host key

Host-key + ‥
F go to full screen
del Send ctrl-alt-delete. Compare with VBoxManage controlvm <vmname> keyboardputscancode 1d 38 53 e0 9d b8 d3 e0

See also

VBoxManage.exe setextradata global GUI/Input/MachineShortcuts …
Oracle VM VirtualBox

Index

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