Texmod and modding

Hello. Recently I saw a topic about texmod and detail enhancement using the Topaz Filter from (what i guess) is photoshop, how do i do that?
Thanks x1000

Using the Topaz Filter?
Or do you want more info on the whole concept of tex modding? (if so: http://wiki.guildwars.com/wiki/Texmod )

i wanted to know more about the topaz filter