Why did Nick give Moussoui a computer??
Apparently he knew a bunch of Arabs at Norman. There seems to be conflicting information about whether he gave the computer to Moussaoui, or let him use it on a bus, or sold it to Moussaoui, or whether he did one of those things with a mutual acquaintance of himself and Moussaoui.
In my opinion, the question of whom he knew in Norman is important to understand exactly who he was and what he was doing in Iraq. The other important questions are who he was working for in Iraq, who paid him, how he got his jobs, why he was working at night, what he was doing during the day, and which police/military groups held him, and when.