Determining the IDO for an event handler

For some application event handlers, you must know what IDO is being called upon.

Open the form for which you are creating the handler.
For example, to create a handler that notifies you when a new user is added to the database, you would open the Users form.
Go into the designer for the form (Web Designer for the web client, Design Mode for the Windows client).
On the Form Properties sheet, click the Collections tab.

The IDO displays in the Collections tree. The actual name of the IDO is shown after the period.