Many people might not care about co-op play, but now I specifically look for Co-op in a game.
That said, I can't believe no one has mentioned the co-op in this (PC) gog version!

So does the co-operative feature work?
And if yes, then please describe the interface so I have an idea of the interface/ match-making system.

I have not tried the co-op so I can't tell you how it works, but I can tell you that you need to get a key from GOG in order to play in co-op. To do so, go here:

http://www.gog.com/en/support/contact/technical_issues_with_games/two_worlds

Select "multiplayer key request" from the menu and then send it. You should get an email from GOG with the key in a few business days.

And yes, this is a rather weird and obtuse way to get a multiplayer key.

Thank you, Waltorious! Your information definitely helped, so I figured I'd thank you formally. That IS a weird way to get a multiplayer key. I am just very skeptical with these old games on whether they support multiplayer in any way, shape, or form.

But the original question still stands. If anyone has tried to play multiplayer on Two Worlds (epic edition from gog), then I'd like to know if and how it works.

Thanks for the info Waltorious.

In a few business days!?! Are you kidding me. Thats lame

Why is it lame? Waiting a few days isn't that long or bad.

Since the question was dug up anyway, let me answer:

Basically in Two Worlds, multiplayer consists of different maps. First you go to a city you select where you can meet other players and find games to join, you can also shop, train, and sell things here. Then you have to select a map from a list once you find or start a game. Take the game map from single play, but it's all split up into sections. You and your friend(s) will play one section of map at a time, you have to solve about 3 quests on each map before you can continue to the next map.

There are other quests and fighting type arena things you can do, not all are found in single play, but I haven't done or tried them all yet.