Oops... missed your reply...

DEI's window controller is about $90 at best buy. It interfaces between the switch and motor, and reads the inputs from the switches, giving you one touch up and down. That's by itself.

If you hook up the ground-while-armed (used for starter kill relays, for example), the module will also roll up the windows.

If you also hook up a second channel ground input, you can either roll the windows down totally when disarmed, or crack them one inch within 20 seconds of arming.

You can insert the module between the drivers door switch and windows, but the passenger window switch will then be on the "motor side" of the wire, and passenger wont have one-touch control. If you run the passenger window wires over to the passenger door and tie the module in there, then passenger would also have one-touch.

It's a pain, and most people only connect everything in the drivers door... but it's an option.

I don't think there is a suitable ground-while-armed trigger outside the SMART entry module to use this with the factory system. You could use the ground-during-key-lock trigger wire from the front doors to roll them up (its a wire that tells the SMART module you locked the doors with a key). But who uses keys to get into an Xterra anymore?

If you want to discuss further, this should probably be a new thread.
-=RB42