Format of HCLINE parameter block:
Offset	Size	Description	)
 00h	WORD	length of following data (multiple of 4)
 02h 2N WORDs	X,Y coordinates for each of N points in polyline
Notes:	the first line segment is drawn beginning at the current position
	on completion, the current position is set to the last point drawn
SeeAlso: #03907,#03918,#03900