32-bit signed integer by value (required)
Passes the relative logical record (or block number for a NOBUF file)
where the logical record pointer is to be positioned. The
number of the first logical record is 0.
On disk files, the EOF indicator is the file limit.
If the filenum parameter refers to a byte stream file, the lrecnum
parameter is interpreted as a byte offset to which the file pointer is
set.
(KSAM) For fixed-length files, record numbering starts with 0 or 1,
depending on how the file was created.
(KSAM/3000) For KSAM/3000 files with variable-length records, the
number of the first logical record is 0.
