-#### $a
-$a is the Friendica `App` class.
-It contains a wealth of information about the current state of Friendica:
-
-* which module has been called,
-* configuration information,
-* the page contents at the point the hook was invoked,
-* profile and user information, etc.
-
-It is recommeded you call this `$a` to match its usage elsewhere.
-