.he 'NOT''Page %'
.fo 'Steven Hardy''January 78'
NOT	This function returns the opposite truth value to its argument.
It could be defined as:
 	: FUNCTION NOT(TRUTHVALUE);
 	:	IF	TRUTHVALUE
 	:	THEN	FALSE
 	:	ELSE	TRUE
 	:	CLOSE
 	: END;
.br
(If TRUTHVALUE is FALSE this returns TRUE.
If TRUTHVALUE is anything else it returns FALSE).
