B: lgu.at( b, fort );
C: #equate lgu_at lgu.at void lgu_at(FILE *stream, int fort);
LGU.AT will associate an I/O unit in a Fortran~66 program with the given B I/O unit. The B unit must be open. All input or output by Fortran routines to the I/O unit given by "fort" will use the B unit given by "b".
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