138a45f8_ce_and_Data_Specifications_1_0__1
[2] Returns the number of MCI devices of the type specified by the device-name field. The device-name field must contain a standard MCI device type. Any digits after the name are ignored. The special device name all returns the total number of MCI devices in the system. [1] 
quantity
Multimedia Programming Interface and Data Specifications 1.0
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