rect	struc
left	dw	?
top	dw	?
right	dw	?
bot	dw	?
rect	ends

bitmap	struc
bounds	db	(size rect) dup(?)
bytes	dw	?
pntr	dd	?
bitmap	ends

segoff	struc
offs	dw	?
segm	dw	?
segoff	ends
