Function: Notifies the blog admin of a user changing password, normally via email.

Function: Returns the time-dependent variable for nonce creation.

Function: Verifies that a correct security nonce was used with time limit.

Function: Performs a safe (local) redirect, using wp_redirect().

Function: Parses a cookie into its components.

Function: Removes all of the cookies associated with authentication.

Function: Determines whether the current visitor is a logged in user.

Function: Checks if a user is logged in, if not it redirects them to the login page.