This is a variable that is filled in by the Storyboard Engine to contain the path to the Storyboard Engine's plugins directory. This is the directory that is specified to the model_mgr using the
-omodel_mgr,plugin_path option or via the
SB_PLUGINSenvironment variable. This path can be used to load application specific binaries that may be packaged with a particular Storyboard Engine. This variable is only applicable for systems that dynamically load plugins from a filesystem.