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A network projector is a video projector that is connected to a wireless or wired local area network (LAN).
What sets the network projector apart from other presentation methods is that you can connect to and operate the projector remotely over a network connection. If your computer can connect to the projector, you can deliver a presentation from any location that has network access, whether it's your private office or a conference room where the projector is located. Those who want to view your presentation must be in the same room as the projector; they can't view the presentation over the network from a different location.
http://windows.microsoft.com/en-IN/windows-vista/Network-projectors-frequently-asked-questions