Steps to create a co-op campaign server?

[Steps to create a co-op campaign server?]

Thank You, Whisper.

Now that I can start the server, two questions about connectivity:

Do I need to forward the listed port on my router to my PC hosting the game?

Can my friends join my campaign through Steam or Gamespy or do I need to send them my IP?

Thanks!

[Steps to create a co-op campaign server?]

It was marketed with the claim that the game supports this mode of play and is the main reason I purchased this title (and subsequently upgraded my vid card from an 8800 to a 5850)

"Play the entire solo campaign cooperatively or dive into huge PvP battles for control of the whole map."

from...

http://www.arma2.com/overview_en.html

[Steps to create a co-op campaign server?]

Hello,

I am looking to play through the campaign with other players over the internet.

Is there a guide on how this works somewhere?

When I am in the multi-player menu, how do I start the full campaign instead of one of the missions?

When I start a server on my PC, will people be able to see it on the GameSpy browser page automatically or do I need to give them my IP?

Thanks!