Have you got Hamachi? If not both of you need to get hamachi then set up a private network, when you have set up the private network it should say your network IP at the top, note this down as you will need it at a later date, once you are on the server and have hamachi up and running launch Em4. Then once you and and your friend/friends have loaded up the mod you want to play one of you host the game, once one of you has set it up the other wants to go to join Direct IP and put in that Network IP that i said to copy earlier and it should work.
I play multiplayer on this game a fair bit, my favourite mod for multiplayer is the bieberfelde.
how do i open it or set it up so my friends can see it
How do I play emergency 4 L.A Mod in multiplayer?
in Multiplayer
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how do i open it or set it up so my friends can see it