If you have a Linux VirtualBox guest accessed from a Linux machine, e.g. via rdesktop, then you cannot just press Ctrl-Alt-F1 to switch to the first virtual console, as your real computer will act on it. Instead, you can use
VBoxManage controlvm VBoxMachineName keyboardputscancode 1D 38 3B 9D B8 CB
to simulate a Ctrl-Alt-F1 keypress. For the other F-keys, you need to increase the third and last number, e.g.
VBoxManage controlvm VBoxMachineName keyboardputscancode 1D 38 3D 9D B8 CD
for Ctrl-Alt-F2.
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