How does nvida reflex work?

How does reflex plugin work? I see no console commands or bp nodes related to it. Just a plugin with zero documentation anywhere in any video or mention on how to use it in nvidias post about it.

Also, as a side question, how does one minimize latency in general ingame? Not counting hardware or just holding a stable 60fps

classic bait and switch. the plugin is free but the know-how will cost anyone (i.e big studios) money