basically it allows for custom dedicated servers, server browsers, custom server rulesets etc like SA:MP (multiplayers for gta san andreas)
So instead of playing thru rockstar servers you load this up then pick a server from the server browser then play online. Especially since people are getting banned for simple shyt like FOV mods
if this becomes as fleshed out as SA:MP it will shyt all over GTAO. Cops n Robbers servers, 200+ player servers, gang war servers etc just all around general fukkery
it would make the multiplayer more like Just Cause 2 multiplayer basically