1. (Or "uid", "user id") A number or name
which is unique to a particular user of a computer or group of
computers which share user information. The
operating system uses the uid to represent the user in its data
structures, e.g. the owner of a file or process, the person
attempting to access a system resource etc.
A user database, e.g.
Unix's /etc/passwd file or
NIS, maps
the uid to other information about that user such as their
user name,
password,
home directory and real name.
2.
user name.