greldak wrote: It may be easier to get a second remote and use your PCs parallel or serial port to control an interface to the keyswitches on the remote rather than trying to identify what code does what. Do this. Seriously. That remote is the exact frequency radio with the exact kind of modulation you need, and already knows how to speak any and all protocols you'll need. Even if all you do is grab the radio guts from it, its probably the cheapest compatible radio you'll be able to find. Even a simple start like keywitches will be a fun little project, is easily doable with C#, and, perhaps most importantly, you'll have something basic up and working in a few weeks. Then you can decide whether to have your fun writing control code, or climbing learning curves as you peel the onion of how the remote talks to the device. For the keyswitch control itself, you could use either parallel port or USB (I'm thinking FTDI serial chip in bit bang mode) without too much difficulty. For USB, consider checking out smileymicros or sparkfun for a simple packaging of that FTDI chip. We can program with only 1's, but if all you've got are zeros, you've got nothing.