What key is the Host key in Oracle's VirtualBox on Windows, Mac and Linux

This short post answers the question, "What key is the Host key in Oracle's VirtualBox on Windows, Mac and Linux."

Host key

Windows and Linux Host

The right Ctrl key is the Host key on a Windows and Linux host

Mac Host

The left Command key is the Host key on a Mac host

GUI

The Host key is also presented in the lower right corner of the window running the VM:

Reference

1.9.2. Capturing and Releasing Keyboard and Mouse in the Oracle® VM VirtualBox® User Manual at [link]