What is the difference between 1.2 or 3 channel alarm systems car?

I recently bought a Honda Accord and came with a dealer installed system alarm, the car also has a remote start. I instsall other alarm system with a sensor. while shopping for the alarms have been 1, 2 and 3 systems what channel is the difference? Also can the alarm system back to buy control of the remote start system on a single remote control?

This will answer your questions. As http://www.drdetailshop.com/alarmfeature.htm to what the new purchase is going to do, ask the seller.

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