LaunchDaemon to run as a particular user

I need to have a background daemon process that the system runs under my =
user automatically, 24/7, even when no one is logged in to the machine.=20=


I created a plist and placed it in /Library/LaunchDaemons, and the =
system loads it up, but it runs as root, not my user. I've seen this =
done before by adding a certain tag in the plist file (the name of which =
I forget), but after googling around for a while I still haven't =
identified which tag it is. (I know a launch agent runs as the user, but =
only when the user logs in, which is why I need it to be a daemon.)=20

Does anyone know of the tag, or is there another way to do this?