The VMM sends system control messages to a virtual device to notify it of changes that affect the system and virtual machines. Most virtual devices need to track the creation and status of virtual machines, so the VMM sends messages to the virtual device whenever a virtual machine is created, initialized, or terminated. It also sends a message when the execution focus moves to or from the virtual machine, or when the virtual shell device needs to display a message box to the user.
The following is a list of the most common messages and recommendations for how the virtual devices should process the messages:
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