When using a vi session within VirtualBox,  how can I send the Escape Key to change modes from input mode to command mode?   I have tried many combinations which do not work:  Ctrl-Esc, Atl-Esc,  Shift-Esc,  Alt-Ctrl-Esc, Shift-Ctrl-Esc, and so forth in every combination.
How to send the Escape Key inside VirtualBox vi session?
virtualbox;vi