Users can be associated to any number of Accounts or Sites. The Account and Site administrators can determine which Users have access. API Key pairs are provisioned at the User-level, so all API requests are made in the context of the User who generated the Access Token. There are two ways to retrieve user details: /v1.1/user grabs the context for the current user you're logged in as. Calling /v1.1/users will give you all users with permission and access to your account.
Here are some other properties that may not be obvious:
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localeis a 5 character combination of language and country separated by a hyphen. Country must be all caps. Here's a little more detail: https://en.wikipedia.org/wiki/Locale -
time_zoneis the standard 3-4 character abbreviation for global time zones: http://www.timeanddate.com/time/zones/