The ODCLASS window is invoked with ODCLASS_GUI command.
The ODCLASS window contains a hierarchical menu of commands, search by object types and the object type menu window. The object type menu has three tabs: Classification, Recent, Favorites.
To call ODCLASS commands from the menu, press the left mouse button once.
To draw from the object type menu window – double click the left mouse button.
To call ODCLASS commands from the command line – enter the name of the desired command.
See more fully in: