## Physical Device Driver Reference

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### Pointer to Next Device Header

This pointer is set by OS/2 2.1 (or later) at the time the physical device driver is loaded. This field should be set to -1.

Note: For a character device driver that supports multiple devices, the data segment must contain a device header for each device. These headers must be linked together and the link pointer in the last header must be set to -1. The first WORD is an offset; the second WORD is the segment.