you can get grunt mods for halo trial but not halo pc. If you want a grunt mod for halo pc, then you will need to mod it yourself with HMT v3.5, Spark edit v3.02, and/or HHT v5.
Yes. There are a lot of mods for Halo and Halo Trail on PC.
As far as I know there isn't a co-op mod for the PC
No,, unless you mod the game on the PC
they don't have one yet... but u can get the halo 1 trial @ microsoft.com
There is no Halo 3 mod for Halo Trial. Halo Trial is one of the hardest versions of Halo to mod. There are however, custom maps for Halo Custom Edition. To get Halo Custom Edition, you need to have Halo: Combat Evolved installed on your PC, you also need your CD key. You can download Halo: Custom Edition free.
If you are using the PC version you can use a program called halo custom edition, just type it into Google. Unfortunately there is no easy way to mod on a console.
No. Only in the PC version if you mod it.
Need to make a Mod menu or download one.
http://www.moddb.com/mods/elite-campaign
Technically its not Illegal to download it, It's Illegal to be the person who cracks the game, And if your referring to Full auto on pc there not cheats usually for pc games it's a "Mod" Which modifys the current game and edits whatever the mod is supposed to edit, To find Halo 2 I say just google "Halo 2 Pc Download"
Yes, you can mod campaign mod on the Halo trial.