It is recommended that all applications refer to connectors using the MCI_CONNECTOR_TYPE flag. This provides device independence from differences in connector numbering for various hardware devices. Additionally, the MCI_CONNECTOR_INDEX flag can be used to address different connectors of the same type.

If only the MCI_CONNECTOR_INDEX flag is used, the referenced connector is device dependent. The connector type of a particular connector index, as well as the number of connectors, can be retrieved using the MCI_CONNECTORINFO or MCI_SYSINFO messages.

For a list of connector types which are supported by various device types, see the Remarks section for MCI_CONNECTORINFO.