INT 62 u - FGDRIVER v4.02 - "FG_VBTCCOPY" - COPY RECTANGLE BETWEEN VIRTUAL BUFS
	AX = 00D7h
	ES:BX -> variable record (see #03511)
	CX = source virtual buffer's handle
	DX = destination virtual buffer's handle
Desc:	copy rectangle from one virtual buffer to another with transparent
	  colors
Notes:	the FGDRIVER functions are rearranged with each major release, but
	  their parameters do not change (see #03474)
	if the destination buffer is the same as the source buffer, the regions
	  must not overlap
SeeAlso: AX=00CFh,AX=00D0h,AX=00D6h,AX=00D8h


Format of FGDRIVER VBTCCOPY variable record:
Offset	Size	Description	(Table 03511)
 00h	WORD	source region's left edge
 02h	WORD	source region's right edge
 04h	WORD	source region's top edge
 06h	WORD	source region's bottom edge
 08h	WORD	X coordinate of destination region's upper left corner
 0Ah	WORD	Y coordinate of destination region's upper left corner