FT long time ago had a not so small community focused around playing via multiplayer. There were made some rulesets. The most popular are described here:
http://rules.ovh.org/
It is suggested to play by hamachi.

I played right behind with a time .... the multiplayer is quite fun ..

Interesting. I must try this out. Many thank you for beautiful thread!

The main page says something about some multiplayer modes being unavailable now. What modes are they referring to? Also, does the game have any kind of direct connection mode?
If I can play this co-op with a friend, I'm sold. If not, I'm withholding purchase for a while.

Yes. U can play by direct connection (hamachi is good for people who have their ports blocked and cant connect by ip).
If u say co-op mode, u mean playing main campaign with friend, right? I think it is possible to convert singleplayer maps to be playable in multiplayer, but it needs a bit of work. There are also some coop maps, but they need more than 2 players to be fun.
And i dont get part "some multiplayer modes being unavailable". Can u explain that? I dont see anything on main page saying that...
And also here it is movie (made by me ;) ) showing some multiplayer gameplay (rules 10k reg) http://www.youtube.com/watch?v=zYLY0ScytYo

I would be down for some MP sometime.

I guess we're going to have to wait until they can dole us out unique Software Keys, as that wasn't part of the original package. Other games have problems with multiplayer due to identical user IDs.

You dont need any cdkey to play Fallout Tactics.

Hello, let me start by saying I KNOW this thread is 12 years old. However, this is important for me to get off my chest.

I belong to an online community known as The Khans, who have played and raided different games since the year 2000, and we started on Fallout tactics. The original founder and idol of The Khans (aka TKs) is know as Viren, or Viren_TKs or Viren_Samedi.

Viren created The Khans faction, the, vanished for a bit in 2000. He returned for a short period of time in early 2001, after the new president, TKs-Gargantua took over and continued the Khan Legacy. Shortly after, he once again vanished and we haven't heard of him ever since.

Now, The Khans are approaching our 20th anniversary and we have spent years looking for Viren, our original founder. He is revered like a god, so to speak, and it is an enormous goal for us to find him again. Please, if anyone has any info on this man, let me know! Again, it is Viren, Viren_TKs, or Viren_Samedi.

We know you are still out there somewhere Viren, and we won't stop until you are back with us, where you belong!

- 3rd generation Khan, TKs-Gimper o/