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Remote Desktop for Administration is the default implementation of Remote Desktop Services (RDS) on a Windows Server 2008 R2 server. In this mode, as many as two administrators can be remotely logged onto a server at the same time performing remote administration.
It's also possible to configure a server as a Remote Desktop Session Host server so that it can run desktops or desktop applications for remote users. However, configuring the server as a Remote Desktop Session Host server requires additional licenses and a licensing server. When using the server in the Remote Desktop for Administration mode, no additional licensing is required.