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Connectivity is a framework service for transferring messages asynchronously within or between databases.

The message transfer occurs between  the Out Message Box and the In Message Box which can be present either in the same or different databases.

Connectivity Outbox

This contains message data and metadata which should be transferred to the Inbox of the same database or a different database.

Connectivity Inbox

Message transferred from an Outbox end up here to be processed by the application procedure registered for the message.