Add-In Integration

Developers add functionality by creating and implementing External Commands and External Applications. Revit identifies the new commands and applications using .addin manifest files.

• External Commands appear under the External Tools menu-button on the Add-Ins tab.
• External Applications are invoked when Revit starts up and unloaded when Revit shuts down

This chapter focuses on the following:

• Learning how to add functionality using External Commands and External Applications.
• How to access Revit events.
• How to customize the Revit UI.