## Graphics Adapter Device Driver Reference

[prev][next][parent][TOC]

### Creating an Extension GRADD

An extension GRADD can be added to the system without interfering with normal operations. The extension GRADD works in the same manner as a normal GRADD. The extension GRADD identifies itself to the system via the pszFunctionClassID field of the CAPSINFO data structure. This structure is returned to VMAN via GHI_CMD_QUERYCAPS.

The extension layer communicates with the extension GRADD in the same manner described in the "Adding Extensions to an Existing GRADD" section earlier.