Autopage RS-620, 1998 olds intrigue

Alright the car is a 1998 olds intriuge

Now i've installed many 2 way combo units before but i need help with this one LOL. Its very silly i know.Theres acuple feat i don't understand but i think there are the same thing.1,WHITE/ Blue wire (-) instant start and turn off out put.This wire activates and turns off the remote starter each time it sees a momentary ground signal.use to intergrate with factory or aftermarket system.!pulse is for an aftermarket alarm and 3 pulse is for a facotry system.2,yellow wire(-) 200 ma ign 3 control output.I fully understand what wire this is,as i need this for the bypass module.Now about the factory alarm,do i take both the disarm and rearm wire from the new alarm and t-tap that on the factory disarm wire???Never had to worry because i would always just put the factory alarm to sleep as there where getting a combo unit.So that blue wire did i need it???I know im probly reading into it to much,but i need to be 100% right before i tackle the job.See its for my grandma,and well i really just want her to have the RS feat,but i know the factory remotes won't work well its running.

I just wanted to know could i take the horn honk out put wire on the RS/keyless entry and attach that to a siren unstead of the horn.Im not too sure if that wire is the same as the siren wire when just doing a alarm???also if i dont use that wire,can i just take that (-) wire and t-tap that right to the horn wire (-) with out useing a relay.what would happen???

I was just looking in my 620 manual and i don't have any (-),(+) door pin supervisor wires.I mean this is a RS/Keyless entry.How is the brain suppost to know that the door is open i even took a pic to show what i mean.How would i go about adding this feature???or isit not possible

its a 1998 Cavailer that its going in

And yes my hand is very shacky

But can it be done???,if not how does the alarm know if the door is open