Edit the "coopordie.bat" file in your Quake2 directory and set your own name and password. When in pregame map, you need to type the "o" key for connecting (more explications here).

For other players being able to join you, your quake2 need to be reachable from the Internet. Routers, NAT, proxy and firewalls may block teh connection. You can manually unlock the port 27910 for both UDP and TCP, or you can use virtual network tool like Hamachi.

If you get stuck, simply return to the startmap by typing "wsrv_login" (by default, it is bound to the key "o")

For using an enhanced Quake2 engine, you only have to install one, and launch it in place of the standard engine. For example, after installing EGL Quake2, you have to modify your "coopordie.bat" file and replace quake2.exe by egl.exe.

If a mapper want to add his maps, like the Stench campaign, feel free to contact me too, I would be happy to add a teleporter in the startmap. It is also possible to create cool mission with existing deathmatch maps, by only adding entities, like the "punishment" or "rush for the head".