Originally Posted by from the readme
VI. Starting Netplay
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So now we get to the Netplay part of Mupen64K, this section should provide a guide to properly setting up Kaillera.
I provided two versions of Kaillera: Supraclient CPPE, and the original core.

To run one of them, set up your plugins, and rom directory and then goto Utilities ->Kaillera // Old Kaillera
IF THIS IS YOUR FIRST TIME ON KAILLERA, USE OLD KAILLERA BECAUSE IT HAS MORE CHECKS TO ENSURE LESS GLITCHES.

For that matter too, I will only provide a guide on using Old Kaillera!

First, enter your username in the username box. (this is on the bottom)
Next, select ´Good (20 keyframes/s)´ as your connection type.

Now, you may use another server but for pratical purpose, and ease of writing this guide I will just tell you how to connect to Emularena Grounds

Click ´Enter IP´ and paste this address into the box:
69.90.34.14:27888

Now click connect! Next time you want to join the server, check your Recent tab.

So now you should be in the server, if it doesn´t connect that means the server is down, and you now have an opportunity to figure out how to refresh the
serverlist by yourself... (I hope this never happens LOL)

You should have two buttons now ´Join´ & ´Create Game´...
If you set your ROM directory up, you should be able to join games with people playing on the same version of Mupen as you.
If you click create game, and see nothing then follow these guides:

Make sure you set your directory.
Refresh your ROM List.
Restart Mupen64K, after setting your directory.
Restart Kaillera...
If you have a ton of ROMs then make a smaller folder and use that as your directory... (remove the old one from your list)
Redownload Mupen64K, you might have a bugged Mupen64.ini
Post on www.emularenagrounds.com or any emulator forum supporting Mupen64k, asking for help. (please explain specifically the problem) (sign up)

Sometimes when in games you desynch, this is caused by dropped packets (game data), or lag. Just restart the game if this happens... However
Mupen64K rarly desynchs, and it even plays games like Goldeneye...