@Paul: As the past tense of the verb, it would be logged in, as in I logged in this morning. As an adjectival phrase, it could be either logged in or logged-in, typically depending on placement, e.g.
It would seem from your description of COCA's usages that they use "to log in" when their prepositional phrase is not about what is being logged into but about something else since "to log into" would require a direct object to be grammatically correct.
The person was logged in to the website. log in is a phrasal verb so only the first part of the verb changes when you wish to change the tense. It follows the same rule as sit down (She sat down.) or drop out (He dropped out of school.) See also the usage note for log in on dictionary.com.
The user has been logged into the application and the ones that haven't. As the logged-in users always have a session on the application, I considered choosing sessioner.
And the message is shown in a pop up window. However, I am not sure which form is better to use. Please, explain which sentence is better and why. Thanks. You have successfully registered and logged in. or You have been successfully registered and logged in.
For my money, log on to a system or log in to a system are interchangeable, and depend on the metaphor you are using (see comment on your post). I suppose there is a small bit of connotation that "log on" implies use, and "log in" implies access or a specific user. Not to be confused with "login" - a noun describing a combination of username/password. I'd pick 1) because the program is ...
They seem to be synonymous and from my experience they definitely are. In computer security, a login or logon (also called logging in or on and signing in or on) is the process by which individual access to a computer system is controlled by identifying and authentifying the user referring to credentials presented by the user. A user can log in to a system to obtain access and can then log out ...
There are a lot of questions concerning the correct use if login, log in, etc. When speaking directly to an use I would say You can always change this permission by logging in in the internal do...
Access -- What can this user do? A user who has access is an authorized user, or inversely and unauthorized user. In this case what you have is either a "logged in" user who is an authenticated and authorized user, or a "non logged in" user who's an unauthenticated yet also authorized user. More simply a known user, or an unknown user.
A distinction can be made between 'not logged in' and 'logged out', in that 'logged out' may imply that the system has a record of a previous session where the user was logged in.
