MDT 2012: Hide shell during installation

MDT 2012 introduced a new feature which is very convenient in my opinion. In MDT 2010 the shell was visible and active during installation. Which could lead to users interrupting a running installation. Now it's possible to hide the shell by using the following line in your customsettings.ini.

HIDESHELL=YES

Now you can get rid of your Post-It notes telling people to stay away from this computer.