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POINTER TO NEXT DEVICE HEADER FIELD
The device header field is a pointer to the device header of the
next device driver. It is a doubleword field that is set by DOS
at the time the device driver is loaded. The first word is an
offset and the second word is the segment.
If you are loading only one device driver, set the device header
field to -1 before loading the device. If you are loading more
than one device driver, set the first word of the device driver
header to the offset of the next device driver's header. Set the
device driver header field of the last device driver to -1. |