## Graphics Adapter Device Driver Reference

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### GDDINITOUT Field - cFunctionClasses

cFunctionClasses (ULONG) Number of function classes supported.

In most cases, this value will be equal to one (1). A GRADD can, however, return a zero (0). This is typically done by filter GRADDs that do not want to be entered in the CHAININFO/GRADDINFO information returned to the translation layer via the VMI_CMD_QUERYCHAININFO function. A GRADD can include built-in extensions by returning a value greater than one (1).