Blank Monitor? (for specific devices)

Hello,

If anyone is familiar with the remote access service, LogMeIn, you will know that it provides the user with the functionality to 'blank' the monitor connected to the computer that you are accessing. You, however, still have the ability to see what is on the screen through LogMeIn. Through C#, how is this possible? I am assuming that LogMeIn is treated as a virtual device (monitor) and then disables all devices except its own. So how would I go about doing this? (I would prefer specific APIs over DirectX) I want to specify which device is blank or not or display different content on device A versus device B.

Does anyone have any idea for creating virtual monitors? If this cannot be accomplished in C# then the other language that I could write it in would be java.