CLASS                Define a Class for Object Oriented Programming
 CLASSDATA            Define a CLASSDATA variable for a class (NOT for an Object!)
 DATA                 Alternate syntax for VAR: instance variable for the objects.
 ENDCLASS             End the declaration of a class.
 ERROR HANDLER        Designate a method as an error handler for the class
 MESSAGE              Route a method call to another Method
 METHOD               Declare a METHOD for a class in the class header
 ON ERROR             Designate a method as an error handler for the class