2.2.2.28.1 CDCLASS
The CDCLASS enumeration specifies a type of connection driver.
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typedef enum _CDCLASS { CdNone, CdModem, CdClass_Maximum, } CDCLASS;
CdNone: No connection driver.
CdModem: Connection driver is a modem.
CdClass_Maximum: A given CdClass variable will always be less than this value.