v8.0 (2010)

Sets or returns Variant data inside the Plugin object being registered. Softimage does not care about the content or meaning of the data. You can store a wide variety of data, including simple types, Arrays and object references. This API is convenient when you need to access the plug-in data from the XSILoadPlugin and XSIUnloadPlugin callbacks.

Once added the data remains active as long as Softimage is running or until you manually unload the plug-in. The user data is not persisted. See Plugin.UserData for more details.