Nissan vibe and central locking

Was thinking of putting remote central locking on my g/f's car, anyone know if the wires are already in the loom for this, or will it need a aftermarket unit?
The car has NATS i believe, well theres a sticker on the window.
Also i have fitted to it a alarm system that operates from a key fob, a simple 3 wire one, which press once and alarm is on, press again and alrm is off, can this be wired to a remote centrol locking kit, so that one press turns on the alarm and locks the doors, press again and alarm off with doors unlocked.

Anyone know about this?
 
Just ordered the Hawk system from ebay. Will fit that for the misses and get a upgraded alarm system at some point.
 
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