Returns the id of device. If mci-device-id returns 0, this indicates that the device is closed. This will be the case if the device has never been opened with mci-open, if it has more recently been closed with mci-close, or if the most recent call to mci-open resulted in an error. Otherwise mci-device-id will return a positive integer that is unique for the particular mci-device class, and which is of no use to the application other than the fact that it is positive to indicate that the device is open.
See About MCI support in cgide.htm.
Common Graphics and IDE documentation is described in About Common Graphics and IDE documentation in cgide.htm.
The documentation is described in introduction.htm and the index is in index.htm.
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