Control Data Corporation 3300 Reference Manual page 157

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When an INVALID KEY condition exists, no writing takes place and the
information in the record area remains available.
The WRITE statement performs the function of the SEEK statement unless a
SEEK statement for the specified record is executed prior to the WRITE.
Examples:
WRITE MASTER-REC.
WRITE DETAIL OF MASTER-OUT FROM DETAIL OF WORK-AREA.
WRITE PRINT-LINE AFTER ADVANCING 2 LINES.
WRITE HEADER-LINE BEFORE ADVANCING LINE-NO LINES.
WRITE ERROR-REC INVALID KEY ADD 1 TO ERR-COUNT GO TO
ERROR-PROC.
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