http://blog.parallels.com/2014/07/22/windows-desktop-replacement/
http://www.2x.com/support/ras-documentation/manual/managing-windows-devices/
Controlled from the 2X Remote Application Server Console on the 2X RAS server this will force the Windows PC from XP to Windows 8 to boot up and use only the 2X Client. This can extend the life of older Windows PCs.
Make note of the “Admin Mode Password” in RAS console when activating this feature. You can expose the password in the RAS Console by right clicking the managed device → Properties -OS Settings → Show Password.
The PC will boot up in this limited mode even if 2X RAS is not available. To go back to standard boot up reverse process in RAS Cosole.