Varies according to game. The POV increases in Source, for example, as you enter a vehicle. There've been complaints about motion sickness from it, heh.
VIS' running isn't being logged. When you say it crashes, do you mean you leave it alone and the Windows message comes up by itself, or you start clicking all over the place and then it happens?
HL? and the G-Man are mentioned on the "deux ex machina" ("God from the machine") page, heh, along with a load of Star Trek episodes. I guess that shows the kinda people who write for Wikipedia, eh?