New answers tagged cinema-display
A more convenient solution than logging into another user could be the Shades preferences pane which allows you to dim the screen to a degree where it's not noticable that it's on. Combined with muting the audio after remotely connecting this allows you to login to an already logged on user without concern to others. However the security and privcacy ...
There is a tool called "Screens" which sports a curtain mode, blocking the locally attached screen from showing anything you're doing remotely. It may require specifically their software to run to access the machine remotely, but does seem to address your issue. http://edovia.com/screens/
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