GreEscape DEVESC_QUERYDRIVERCAPS Parameter - pbOutData

 pbOutData (PBYTE) - output 
    The address of a buffer that will contain a ULONG variable specifying 
    the number of capabilities. 

    On return, this buffer contains a ULONG variable that specifies the 
    number of capabilities that the driver supports, immediately followed 
    by an array of DRIVERCAPS structures. 

    Note:  This allows a driver to export multiple capabilities (each, in 
           turn, gets its own page in the System icon).