This selector appeared in System 7. It tells if the machine is under Easy Access (version 2 or later) control. This Easy Access version is a Control Panel file which allows one-hand use of Macintosh (only with keyboard).
This selector is only usable if there was an action in Easy Access or if ‘eajt’ selector was called by Gestalt function before it (this is done by Gestalt.Appl).
Note: the result is a mix with values (bits 0-1) and flags.