I\'m writting a java application, and I need to quickly discover any other running clients on any wired or wireless local networks in order to establish a TCP connection.
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A network scan can be very long, even longer on wireless networks. If you need them quickly thru Java you may implement a "meeting point" server on your network. This server listen to a predefined port, clients register on the server on startup and the server can distribute information about the clients on request.
HTH.