INT 16 - PC Tools v7+ DESKTOP - OPEN \DESK.OVL FILE AND SEEK TO OVERLAY AX = FF98h DX = byte offset in file of overlay header (see #00619) Return: BX = file handle for DESK.OVL file Desc: open the DESK.OVL file, seek to the specified offset, read in the overlay header, and seek to the offset specified by the header