Used small 433 MHz receiver and transmitter modules to do a replay attack. Now my computrer can control the lights, the Dutch 'klik aan klik uit' type. Those you can get here in many places. Easy to learn the commands. The setup, connected to 2 pins on a parallel port: ftp://panteltje.com/pub/cracking_klik_aan_klik_uit_img_1003.jpg The Linux software to learn and replay commands: ftp://panteltje.com/pub/lremote-0.1.tgz
No special chip needed :)