What is "specifier" in Channel.Add?

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Its the Quick Note / Special / OPC specifier column of the channel table. Its used by some devices, such as OPC and DF1 to specify the exact desired tag. Some other devices use it to specify additional information about a channel, such as the negative I/O point on differential inputs of a LabJack U3.

If you don't need it, just pass an empty string: ""

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