How to secure a laptop against thieves [duplicate]

Possible Duplicate:
What are the possible ways for prevention of laptop theft?

Hi !

I'm looking for some security hw/sw based solution for my laptop (non standard solution maybe? open the case and add a gsm module.. ). Any means that could:

send a location through gsm, gprs, wifi, lan..

so that the thief does not normally know that it's sending something. I've read about Intel anti-theft technology which also looks good, but I think that the thief can open the case and change the CPU to another one.. anyways, is this solution available for home end users too ?

I'll appreciate any ideas Thank you :)

LoJack for Laptops