Callback

Description

OnEvent

Fired when the associated event occurs (for example, the OnEvent callback for a siOnSelectionChange event fires when a user selects or deselects objects).

Term

Fired when a plug-in is removed from XSI (just before XSI calls XSIUnloadPlugin). For example, Term is triggered when you exit XSI or unload the plug-in.

Unload, Reload

Fired when the plug-in is cached (reloaded) and uncached (unloaded). By default, all plug-ins are cached, but users can remove a plug-in from the cache (by right-clicking a plug-in in the plug-in tree and clearing the Cached checkmark).