To load or unload plug-ins
icon next to a plug-in to view the Plug-in Information window and find additional information about the plug-in, for example the version number and any MEL commands it adds. If you try to unload a plug-in that is providing functionality in the current scene (for example, the scene contains a node type that is provided by the plug-in), you're prompted to force the removal of the plug-in. This converts any nodes in the scene provided by that plug-in to the “Unknown” node type. Even if you reload the plug-in, the nodes remain Unknown.