Switch the tablet on and off programmatically
In order to enable or disable the DTU display (switch it temporarily on or off) one possibility is to use DisplaySwitch.
Further details on its use can be found on winaero.com
For example it could be activated via a batch file containing the command "displayswitch /internal" or "displayswitch /extend" with a desktop shortcut linked to it.
It could then easily be run on demand from the user's login session.
Alternatively you may find that similar functionality is available in a third party tool such as the following:
Please note that we cannot provide support for Ultramon or Actual Multiple Monitors or accept any liability for their use - in all cases please contact the companies in question directly.