**vws usb remove** *machine* [ *pattern* | **--address** *bus.device* ]

Detaches USB device.

SNAPSHOTS
---------

**vws snapshot** *machine*  *name*

Creates named snapshot. This means that there would be additional image
file for each virtual disks. All writes would go to new file, and
previous file would be unchanged until commit operation. Note that 
having long chain of snapshots significantly slower disk IO operations.

**vws** allows snapshots be made only when virtual machine is stopped.

**vws** **commit** *machine*

Writes changes in the current snapshot into previous one.
There would be one snapshot less for this machine after this operation.

If this operation is performed on stopped machine it operates on stack
of snapshots created by **vws** **snapshot** command.

If it is performed on running machine, this machine should run in the
snapshot mode (see **start** command for details) and changes made since
start in the snapshot mode are committed into permanent images.

**vws** **revert** *machine*

Discard changes made to disks since last **vms snapshot** command
and recreates snapshot. This command can be only performed
on stopped machine. Number of snapshots would be same after this
command.

**vws** **snapshots** *machine*

List named snapshots available for given machine. This command
can be used on running machine, despite of that machine must be shutdown 
before snapshots could be committed or reverted.

MISCELLANEA
-----------

**vws** allows to take virtual machine screenshot or record sound,
produced by virtual machine. One don't need to have GUI window open to
take screenshots.