Patent ID: 7675889

Claim:
A communication system comprising: a common communication medium; a first communication terminal, connected to said common communication medium and having a first network address, the first communication terminal including an emitter for emitting a signal in space so that a sensor can detect said signal through said space to establish a private communication link between said emitter and said sensor; and a second communication terminal, connected to said common communication medium and having a second network address, the second communication terminal including said sensor for detecting said signal through said space, wherein said first communication terminal includes means for receiving an output signal of said sensor via said common communication medium, means for making a comparison between the output signal of said sensor and a decision threshold, and means for establishing a session via said common communication medium between said first and second network addresses if a strength indicated by said output signal is higher than said decision threshold, and wherein said first communication terminal is a client terminal and said second communication terminal is a server.