Might be of some help :
Check Elektor release from May 2002 (approx , i'm not sure about the releases in other countries). It has an article about remote control using SMS.
It has several digital input and outputs , and a pc link. It also responds to commands sent via SMS and change output states, and bypasses the pc. It also relays data through SMS.
http://www.palmtec.de/PalmTec/Aktuel...h-sms-exbo.htm
http://www.elektroniknet.de/topics/k...kel/02014b.htm
(all in german)