Remote Desktop: multiple users viewing same desktop session

Is it possible to have two people view the same remote desktop?

That is, both people log in using the same user account and they see the same desktop session.

The intention is for collaboration / tech support. Ideally, both users would be able to control the session, however, a solution where one user is view-only would be ok.

Server is Windows Server 2008 R2.

This is possible from Terminal Services Manager (tsadmin) and user's Remote Control tab in AD In TSAdmin on the server that the user's logged into, right-click their RDP session and select the "Remote Control" tab.

It's not strictly technically possible with TS\RDS but as TomTom stated, an administrator can "shadow" a user by initiating a remote control session of the users TS\RDS session.