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Refer to the API Reference book of this help file for explanations and descriptions of errors, types, constants, and functions in the FPGA Interface C API.
The C API is essentially a C version of the LabVIEW FPGA Interface. The LabVIEW FPGA Interface is installed with the LabVIEW FPGA Module and with the NI-RIO software. Functions in the C API correspond to VIs and functions on the FPGA Interface palette in LabVIEW. Referring to the FPGA Interface book of the LabVIEW Help may help you understand how the C API functions work.