2002 Nissan Altima window feature

i did my research and could not find an answer that satified my questions. i'm trying to figure out this info for a friend of a friend. he wants to retain his oem window roll down feature with an aftermarket alarm. the local shop said he would lose this feature. i read a post here and it said if you take the wires at the switch in the door, you would retain the feature. another person said he had to set him altima up for double pulse unlock and it would cause his windows to roll down just a little bit whenever he unlocked. my question is: how does the window rolldown work? do you need a latched signal to roll it all the way down or do you just pulse the "autodown?" isn't there also a window roll up feature?

will this do only one window? how do you unlock the doors without wanting the windows to roll down? does the 611t latch only after pressing the button for 2 seconds or so?