You can view information about all the subscribers to events in an application from Event Subscriptions page. You can open this page directly from the development environment or from the Session List page in the Microsoft Dynamics NAV client
To view the event subscription from the development environment
On the Tools menu, choose Debugger, and then choose Event Subscriptions.
To view the event subscription from a Microsoft Dynamics NAV client
Start the Microsoft Dynamics NAV client.
In the Search box, enter Sessions, and then choose the related link.
On the Home tab, in the Events group, choose Subscriptions.
The 9510 Event Subscriptions page lists the event subscribers in the application. For information about the fields for each entry, see Event Subscriptions