(what is this box?)
Desktop Composition is a screen drawing mode introduced in Windows Vista. Aero Glass Visual Themes require this feature. It is disabled by default for Remote Desktop sessions for performance reasons. However, if you use Remote Desktop Session Host (ex-Terminal Server) and VDI scenarios where remote machine (either server or virtualized workstation) serves as a replacement for a desktop PC, you can enable it.
Remote computer requirements. The remote computer means the computer you connect to with the remote session. It may be Windows Server with Remote Desktop Session Host server role enabled or a client computer OS. It doesn't matter if they are running on hardware or in a VM. No special hardware is required. For example, the remote server could use an old graphic card (not Aero-capable) with default inbox drivers.
Open Server Manager: click Start, point to Administrative Tools, and click Server Manager.
NOTE: You can also open Server Manager by typing the following at a command prompt: servermanager.msc
In the Features Summary section, click Add features.
Select the Desktop Experience check box, and then click Next.
Complete the wizard by clicking Install.
NOTE: Windows Server 2008 is not supported. Supported server OSes are Windows Vista, Windows 7 and Windows Server 2008 R2.
What will not work with Desktop Composition and Aero Glass Visual Themes in Remote Desktop sessions