......Just where is Psitech described in D20 Future/Modern rules?

I recently bought D20 Future Tech and the equipment chapter has a few various bits and pieces of Psitech, as well as gadgets and flaws for Psitech items..... But I've never seen mention of Psitech in D20 Modern, D20 Future, or D20 Cyberscape, as far as I can recall.... I've skimmed some parts of my books and still see no explanation for what the heck it is, how it's made (in game/rule terms), or how it's supposed to be used.....

D20 Future and D20 Cyberscape were both rather disappointingly lacking in psionics material (far as I can recall, there was just one or two cybernetic implants that granted a bit of psionic ability, such as the Wild Talent feat, and a few mutations that granted telepathic or telekinetic ability). But now, D20 Future Tech has a few bits of Psitech in it, with no explanation for it that I can find....

Any help is appreciated, thanks.