A series of novels, and later television series, by William Shatner. Slightly silly and campy, but not that bad on the whole. Fairly complex story lines, but suffice it to say it takes place the 2040s (2120 in the books) with the main character being an undercover cop by the name of Jake Cardigan.
The "tek" in Tekwar is an addictive drug-like thing that's actually a computer chip which stimulates the brain to conjure up virtual reality fantasies. Think Simsense if you're into ShadowRun.
Other notable characters include:
The Theme song was probably the best part of the whole TV series; the song is "Real or not" by Warren Zevon.