Sets a pointer in the active input buffer.
||Optional A field number. Specified as a number or as a reference to a buffer or a select list that contains the field number.
PROC command sets the primary input buffer (PIB) pointer to a specified field within the buffer. If field
is larger than the number of fields in the PIB, S
adds the specified number of empty elements.
REALITY emulation does not add empty elements when field
is larger than the number of fields in the PIB.
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