the how to was written in june.
His question was about how to open ports, which the How-To covers.
as far as lan games go i think the updates have renedered that "out of date". For example: the line "If you're playing on a LAN, the player who will host the game should click on the LAN checkbox up near the server address and click on Yes when the prompt comes up asking if he wants to run the LAN server." doesn't seem to apply. there is no lan check box.......or i can't find it. still haven't been able to set up a lan game with retail version patched to 1.5
As to your question about running a Lan game, let's see if I can help you out with that. The HOW-TO may be slightly out of date for that. Now instead of checking a LAN checkbox, you press a "LAN GAME" button. You'll see this LAN button after you press the Multiplayer button on the main menu. We changed it to this way in an attempt to make it more obvious.
After you press the LAN button, you'll see that the "Server" box says your IP address (something like 10.1.1.xxx). Have the second player press the Multiplayer button on the main menu, and choose LAN game. Have them change the number in their server textbox to match the number in yours. This is covered in the HOW-TO, but I don't mind helping you along.
Hopefully that helps you out Helkin1.