bypass kits extra features

First off,  I know this is going to sound like a stupid question but i searched for many hours and couldn't find anything.

Anyhow, at ifar.ca they have many bypass kits available - I have bought a couple and have used them in conjunction with aftermarket alarm systems - in order to remote start cars that need these.

I have understand that part of it.  The units are needed to copy the information from our OEM keys to "BYPASS" the security.  My question is: how do i take advantage of all the other functions these kits can do?

here is an example: https://ifar.ca/en/products/can_bus_kits/duo-can-2/

this product has check marks on "Door lock, Door Trigger, Alarm Disarm, Alarm Arm, Trunk Release, etc.."  Does this mean that this unit can do all that as well? If so, does that mean that i dont have to buy an aftermarket alarm system to use in conjunction with this?  These kits never come with a remote so i never knew what all these other things are for.

I usually use the aftermarket alarm i buy to hookup to all the extra features like "Door lock, unlock, trunk open, triggers" and tie it into the bypass to allow for remote start.  If i could somehow use these ifar.ca units to do everything, where could i get the remote for them?

Or maybe they are tied into your original key fob?  If so, how do i program the key fob to activate features on the Bypass kit?

As i said, it probably sounds like a really stupid question but after hours of searching, i give up and just hope that someone can help :)

Thanks in advance!