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

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

Function: Validates a URL for use in a redirect.

Function: Notifies an author (and/or others) of a comment/trackback/pingback on a post.

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.

Function: Ensures intent by verifying that a user was referred from another admin page with the correct security nonce.