This is descending into chaos quickly again. Please dont use this as you own "I know nothing, get me up to speed" thread.
All you should have to know is in the first posting. So are compiled versions of all the working cores so far. Sometimes - for a short period of time, there are newer compiles in the latest postings.
If you ask questions, please use fully formulated sentences, mostly. How about multiplayer == how about sticky midsummer evenings? Is it possible == I know nothing about it, hit me up with an answer. What is best == you do the thinking.
My games dont save, after about three threads yesterday on what cores exactly have working savesupport implemented == lazy.
In what folder should I - after a tirade, that smartphone users believe in the magical property of folders, and mostly try to share entirely insane hearsay under the label "what worked for me" - after having dissected this two days ago is an insult...
Dont act like you could take over this thread and use it for your own support purposes anytime you want. Dont just drop a question, and wait for others to fill in all the blanks. Try to get a theoretical understanding of the concepts first, before you decide to use stuff. (Homebrew didnt work, once I removed the SD card == thinking didnt work, once I removed brain...)
People talking over each other what they think works, and doesnt - and what they wanted to play but cant - becaue emulator doesnt exist, gets tired fast.
Read and try things suggested, before you decide to post your very own "help me" posting. If you need assistance, try to ask questions that show some basic understanding of the matter - dont just open up with non-sequiturs about "is it possible, does it work, ..." that lead straight into personal requests of assistance - basically try to behave yourself as if you were not a young child anymore, and can figure out some stuff on your own.
Then if you have to ask - ask.
The last two pages in here are extremely hard to parse because of basically four people deciding at once - "hey I could haz them helps me out!" And the stuff that was asked, mostly is answered in here, jut a few postings prior. The less threadjacking for personal "teach me the basics" is going on, the more useful this thread will prove over the mid and long term, to more people than just the ones asking for assistance, one case at a time.
Also please, use full sentences - when asking questions.
Appletrees - how about them?! Doesnt qualify.
As far as the multiplayer is concerned, no and too early. Eventually it will be possible in games that support local mutliplayer (this will probably take a while - multi controller mappings probably isnt the highest priority, while trying to figure out if cores run stable), if you are talking about systems that have multiplayer via a form of systemlink - Retroarch has potential implementations there as well - but those working lies even further down the road.