event_proxy — event sender service plugin
event_proxy connects to the event(8gx) daemon and sets itself up so as to be able to send notifications.
event_proxy installs three service functions, "broadcast_event", "broadcast_select" and "broadcast_unselect", though the latter two are just convenience functions for broadcast_event. broadcast_event is for synchronously sending a notification into the event distribution system. Arbitrary notifications and commands can be sent this way. The return value (i.e. in the eventd network protocol) is ignored.
In practice, midb(8gx), imap(8gx) and pop3(8gx) issue FOLDER-TOUCH notifications. Only imap(8gx) issues MESSAGE-FLAG and MESSAGE-EXPUNGE notifications.