Display Callback Callbacks

Callback | Description
Init (Graphic Sequencer) | Fired after the plug-in loaded (that is, after XSILoadPlugin returns). For example, Init is fired when you start Softimage or load the plug-in in the Plugin Manager. This is where you register a display callback with the graphic sequencer.
Execute (Graphic Sequencer) | Executes the display callback.
InitInstance TermInstance | Fired when a plug-in is removed from Softimage (just before Softimage calls XSIUnloadPlugin). For example, Term is triggered when you exit Softimage or unload or update the plug-in.
Term (Graphic Sequencer) | Optional. Initialize and free any instance-specific data used by a display callback.
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).

Autodesk Softimage v7.5