Finite_State_Machine.php implements the OSInet finite state machine (FSM) of the transducer variety. This is typically used with PHP-GTK to implement fluid UIs with background behaviours. Examples include: FTP downloader, Drupal offload client, various proprietary OSInet back-office applications.

• Installing OSInet FSM
• Using OSInet FSM
• Upgrading apps using FSM (doubles as changelog)
• FSM Tools