Format of FaxBIOS GRAPH_CLOSE_FILE, GRAPH_END_PAGE command buffer:
Offset	Size	Description	)
 00h 12 BYTEs	common data (see #02935)
 0Ch	WORD	graph handle
 0Eh  6 BYTEs	future expansion
 14h	WORD	structure size
SeeAlso: #02949,#02951