Securing Remote Desktop Services in Windows Server 2012 can be done by following the previous guide for Windows Server 2003: http://www.microsoft.com/en-us/download/details.aspx?id=12117 or http://support.microsoft.com/kb/278295.

In addition, using App Locker to further restrict which programs users can run is possible, see http://support.microsoft.com/kb/278295

Note: this article should be updated to replace the above two 2003 guides.