I have seen mentioned on the boards that it is possible to control many parts of a car using programmable relays. How, exactly, does this work? Are there specific relays that work with specific cars? Are there any good resources on the web that might be able to guide me in the right direction? Basically, I have a 2000 Toyota Corolla and I want to be able to control, doors, windows, heat, A/C, fan , etc. all from an LCD attached to my carputer. Is this something that is feasible? thanks!