log in

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log in

the process by which a computer user logs in
Collins Discovery Encyclopedia, 1st edition © HarperCollins Publishers 2005

log in

(Or "login", "log on", "logon") To start a session with a system, usually by giving a user name and password as a means of user authentication. The term is also used to mean the ability to access a service (also called an account), e.g. "Have you been given a login yet?"

"Log in/on" is occasionally misused to refer to starting a session where no authorisation is involved, or to access where there is no session involved. E.g. "Log on to our Web site!"

"login" is also the Unix program which reads and verifies a user's user name and password and starts an interactive session.

The noun forms are usually written as a single word whereas the verb forms are often written as two words.

To end a session is to "log out" or "off".
This article is provided by FOLDOC - Free Online Dictionary of Computing (foldoc.org)

log in

Signing in and gaining access to a computer, local network server, Web server or to a particular account. The login identifies the user, and a username and password are typically required. Although a password is not mandatory for a user's own computer or mobile device, it is always recommended. See password, username and account.

Variations and Spelling
Also called "log on," "sign in" or "sign on," the action of logging in (verb) is spelled with two words: "please log in." However, the process (noun) is one word: "the login." In contrast, to exit the system is to "log out," "log off," "sign out" or "sign off." For example: "be sure to log in" and "her login name is allison77."

Right and Wrong Usage
The verb is two words; the noun is one. Many user interface designers are unaware of this distinction.
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References in periodicals archive ?
Common Node leaves the network and Management agent generates Logout agent which migrates to the Principal Node to logout itself from Principal Node.
If there is some break during the logout procedure, the system stay inside the successfully login state.
Supporters are suggesting Black Country versions of typical Facebook links like "home", which would be "um", "logout" could be "taraa- bit" and "friends" would become "me mates".
In addition, the administrator can provide a logout URL for users to manually logout, set limits for login times and require re-authentication after a certain length of time.
In the upper right of the screen beneath the LOGSA logo and Logout button is a figure that looks like a running man.
* Logout malicious user -- when an attack is detected, WebDefend will log the user out of the web application and indicate to the application that this user should not be granted access in the future.
All the buttons actually cause the computer to logout.
Other employers use employees' computer login and logout times to track their hours.
The top three are: a lack of security behind the front door which exposes flaws in the root access web server, incorrect logout procedures which lets public access terminal users view the personal details of the user that used the machine before them and authentication tokens that can be guessed.
Recorders with ESS feature restricted user access requiring a user name and password; data encryption so that files cannot be changed; an audit trail that captures actions with a time and date stamp; unique electronic signatures for signing records or noting batch data; inactivity logout if no action is performed within a certain time; and, unauthorized use lockout if there are three failed log-in attempts.
To try out the new design, users will have to either logout of YouTube or use Incognito Mode.