@method OpenDocument, MyViewerDialogClass, MSG_MVD_OPEN_DOCUMENT {
  /* The entry point routines send this message when they want to open a 
     document.
     The handler checks the document's version (to make sure it wasn't 
     created by a later, incompatible version of this library) opens the 
     document file, reads its contents, and updates the document 
     display UI. */

  VMBlockHandle 	theBlock;
  WWFixedAsDWord 	*theBuffer;
  MemHandle         	dummyHandle;
  optr   		someObject;
  Protoco