Jakkarra's right. It's one of the earlier games Bungie made, an FPS that came out about the same time as Doom (but was significantly more advanced). And it is very good, though the storyline becomes extremely confusing by the time you get to Infinity (the third game in the trilogy).
Durandal was one of the three AIs responsible for running the colony ship Marathon. Leela was Security, Tycho was Science, and Durandal... opened and closed doors--a menial task which was heavily implied to be a contributing factor to his Rampancy. (Basically, he went insane. Being the Marathon universe though, it's WAY more complicated.)
It's kind of a random conclusion to jump to, but it's the first thing that I thought when reading the post... maybe I need more sleep. Still, there are a surprising number of similarities between Durandal and the typical DF player: (Note that not all of these apply to every DF player, but most are fair generalizations of DF players as a group.)
*Both Durandal and the DF player can see almost everything happening on site, but don't have a physical presence, requiring minions to do their dirty work.
*Neither can force their minions do anything, but must request, bribe, or threaten them (not necessarily in that order). They both do so by means of ASCII terminals and deathtraps.
*Both sometimes have to spend a lot of time locking and unlocking doors and other obstacles to get their minions to go where they want. Doing so often involves making their minions throw switches.
*Both may become fond of favorite "toys", but generally aren't really concerned with the life or death of particular individuals, or even species. These favorites are often minions that have racked up a large body count.
*Spectacular displays of death and destruction follow them around everywhere.
*Both are fond of crushing machinery and lava.
[/end threadjack]