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1 definition found
 for user name
From The Free On-line Dictionary of Computing (18 March 2015) :

  user name
      (Or "logon") A unique name for
     each user of computer services which can be accessed by
     several persons.
     Users need to identify themselves for accounting, security,
     logging, and resource management.  Usually a person must
     also enter a password in order to access a service.  Once
     the user has logged on the operating system will often use a
     (short) user identifier, e.g. an integer, to refer to them
     rather than their user name.
     User names can usually be any short string of alphanumeric
     characters.  Common choices are first name, initials, or some
     combination of first name, last name, initials and an
     arbitrary number.  User names are often assigned by system
     administrators according to some local policy, or they may be
     chosen by the users themselves.
     User names are often also used as mailbox names in
     electronic mail addresses.

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