Relationship Notification Direction.
| Constant | Value | Description |
|---|---|---|
| esriRelNotificationNone | 1 | None - no messages are sent. |
| esriRelNotificationForward | 2 | Forward - messages are sent only from origin objects to destination objects. |
| esriRelNotificationBackward | 3 | Backward - messages are sent only from destination objects to source objects. |
| esriRelNotificationBoth | 4 | Both - messages are sent in both directions. |