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user ID	in computing, a name, usually an alphanumeric string of characters, that allows a user to gain access to a computer system or network with multiple users. A user ID, also called a "username," is used in conjunction with a password.
username	in computing, a name, usually an alphanumeric string of characters, that allows a user to gain access to a computer system or network with multiple users. A username, also called a "user ID," is used in conjunction with a password.

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