DRIVERCAPS Field - ulCapsType

 ulCapsType (ULONG) 
    Defines the returned data type. 

    This field defines the datatype returned in pValueList, pCurrentValue, 
    and pDefaultValue. 

    There are three data types currently supported, specified by the 
    ulCapsType field:  boolean, aggregate of int values, and aggregate of 
    strings. These data types can be defined as follows: 

    #define CAPSTYPE_BOOLEAN                     1L 
    #define CAPSTYPE_AGGREGATE_INT               2L 
    #define CAPSTYPE_AGGREGATE_STRING            3L 

    Note:  When ulCapsType is CAPSTYPE_BOOLEAN, the driver does not have 
           to fill in pValueList.