It's about the Tiberian Sun Era. IIRC, Nox was from March 1999 while Tiberian Sun was from September.
I had lots of fun with this game. It isn't overtly complex, nor is it very deep. But you can interact with almost any object and the world is beautifully renderend, I think. The dialogues contain a lot of humor too.
It's one of those
RPG-lights that combine stats with playerskills to determine how effective your character is.