system_powerdown :: will send an ACPI shutdown request to the virtual machine. This effect is similar to the power button in a physical machine.
system_reset :: will reset the virtual machine similarly to a reset button in a physical machine. This operation can cause data loss and file system corruption since the virtual machine is not cleanly restarted.
stop :: will pause the virtual machine.
cont :: will resume a virtual machine previously paused.
commit all :: will commit running snapshot save to image