This looks interesting..."Jeffers Software Introduces the X-10 TCP Remote Server, rX10 Desktop PC Remote Client and the rX10 Pocket PC Remote Client
This X-10 Remote Server will sit on a computer that is connected to your X-10 CM-11a Computer Interface. You can turn any device on / off, dim / brighten lights, turn all lights on, all units off, change housecodes, change comports, etc. all from within this little application...