If your use CM11A to control your x10 devices that software might be interesting for you. The CM11A emulator is a Java application developed by Jaap Gordijn which allows to do following:
- Emulate CM11A itself: X10 command, event and status report.
- One or more simulated X10 devices (on/off devices, dimmers): On/Off devices and dimmers and two way devices.
- A remote control: using a command line interface, you can change the state of X10 devices, and the CM11A emulator reports this accordingly.
You can download the CM11A emulator here.