Oki C5400 Reference page 27

Proof and Print
Proof and print allows printing of a single copy of a document for
checking before printing multiple copies of the same document. First
the document is assigned a password and processed to a print file.
The file is saved on the hard disk drive and one copy prints. If the
document is okay for printing, the remaining copies are printed on
demand by entering the password through the printer's front panel.
Macintosh OS 9x: Operation • 27