      *> entrycll.cls
      $SET ALIGN(8)
       78 maxnumberbytes               value h"0FFFFFFF".
      *>>---------------------------------------------------------------
      *>> The size of an object reference
      *>>---------------------------------------------------------------
       78 objectReferenceSize          value length of self.
      *>----------------------------------------------------------------
      *> Return false this is not a metaclass.
      *>----------------------------------------------------------------
      *>----------------------------------------------------------------
      *> Return an instance of EntryCallback pointing to the entry-point
      *> aMessageName and up to six parameters. When you send this
      *> instance the "invoke" message, it invokes aMessageName on
      *> object aReceiver.
      *>
      *> The parameters p1 to p6 are optional. The addresses of any
      *> parameters you pass into the "new" method are stored in the
      *> Callback instance. When you invoke the Callback instance, the
      *> parameters are passed through to method aMessageName preceeding
      *> the parameters passed through with the "invoke" message.
      *>
      *> If you pass in more than six parameters with the "new" method
      *> then Callback raises an exception.
      *>
      *>#See the section Using Callbacks.
      *>
      *>----------------------------------------------------------------
