NOTES:	DDT IS A VERY POWERFUL DEBUGGING AID, BUT IS FAIRLY LARGE, SO
	BE FOREWARNED.  IT ALSO USES UP A LOT OF SYSTEM RESOURCES ON
	SYMBOL SEARCHES THROUGH THE STB FILE.
 
	THE ONLY REAL DOCUMENTATION IS TO READ THE COMMENTS IN THE SOURCE
	LISTING.
 
	USE DDT AS YOU WOULD ODT, IN TASKBUILDING AND MOST OPERATIONS.