hello
serproxy is bidirectional.. you can receive and send data from it.
if your programming language supports serial ports you can talk to arduino directly without using serproxy.
serproxy is useful with platforms like flash that, for security reasons, don't support direct access to serial ports or the disk. serproxy communicates via the network to any program that can open a network connection.
if you tell us a little bit more about what language/platform you are using we can tell you how to do it.
massimo