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BYTE : current FPA index as set using F_Set_FPA_index
5. F_Check_FPA_index
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General Description
Get current FPA index and check if index is valid. A valid index corresponds to an individual FPA that has been opened with F_OpenInstancesAndFPAs. If FPA index was set to 0 (all), then this function will only return 0, even if no FPAs are open. Does not indicate whether FPA index is enabled or disabled.
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