Tachyon Detection Grid, I think is one of those cards. At least I think I remember that card being in the Fed research deck.
Yes. It is a keyword so you know which other tech will interact with it. In the core box, I believe the Romulan Advanced Cloaking (I don't have the card in front of me) is the top version of this tech and will allow them to freely warp past blockading ships. Scary stuff. But if the Feds develop the detection grid tech, they not only cancel this ability and the Romulan's first strike capability, but they also cancel the Klingon card that uses the keyword as well.