Creating a single shared 'manager' for your business objects allows you to centralize and standardize all your instance list activities to avoid repeating code in your filters or command handlers.

Using a shared manager, you can:

• Create shared methods and make them available to all your filters and command handlers
• Delegate activities to the manager
• Manage the notification of events performed by filters and command handlers

For more information, see:       

Avoid duplicated instance list code by using a 'Controller'

Manipulate Instance Lists from RAMP Scripts

Delegate Common Tasks to your own Instance List Controller 

Low Level Direct Access to the Visualization Trees