Internal Variable Management and Message Output: Explanation
Returns the minimum number of I/O device that exists and is not connected
(therefore can be used).
return_value = NumRu::DCL.iufopn()
- Explanation of Parameters
||Integer value that returns a device number.
- This value inquires the condition of the I/O device corresponding to the
device numbers 1 to 99, in ascending order, and returns the device number for
the first I/O device which exists and is not connected (not open). If no I/O
devices is available, it will return 0.