Normally it will be controlled by the Guest Additions video driver or the Linux VMSVGA driver, but it can also be controlled by a VGA driver or using the VESA BIOS, which can only set a limit set of the resolutions that the card can handle, and only on the first screen. Each output can be set to any resolution which the configured video RAM size will support (potentially using overlapping video RAM areas). VirtualBox virtual machines contain an emulated graphics card which can currently support up to 64 monitor outputs (the actual number is set by the user before starting the machine). It also points out the tricky parts which might potentially fail. This document describes the way the mechanism is supposed to - and usually does - work. In normal use, with the standard graphical user interface and with Guest Additions installed, VirtualBox resizes guest desktops to match whenever the host window is resized. Please feel free to send documentation patches to the vbox-dev mailing list.
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