Add another monitor to VirtualBox while running?

multiple-monitors virtualbox

Since you can't just adjust the (virtual) hardware without shutting down, one thing you could try is using Remote Desktop Multi-Monitor configuration. This way you just need to reconnect the RDP connection when you disconnect and let the guest operating system adjust to your new monitor configuration:

http://www.virtualbox.org/manual/ch07.html#vrde-multiconnection

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