## Graphics Adapter Device Driver Reference

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### VMI_CMD_EXTENSION - Parameters

gid (GID) - input ID of the GRADD.

ulFunction (ULONG) - input Set equal to VMI_CMD_EXTENSION.

pIn (PVOID) - input Pointer to an HWEXTENSION data structure.

pOut (PVOID) - output Pointer to an extension-specific output structure.

rc (ULONG) - returns Return codes.

RC_UNSUPPORTED
RC_SUCCESS
RC_ERROR