Oki C 5400n - Manual (Page 247)

Windows: Postscript Emulation Driver • 245
Printing Custom Page Sizes
2000 and XP
The printer media size for the tray you’re using must be manually set
in the driver to the custom paper size before use (range 3½'' to 8½''
[89 to 216 mm] wide x 5'' to 14'' [127 to 356 mm] long).
1. Make sure the rear exit path is open:
2. Load the custom paper in the tray of your choice.
3. Open the file in your application and select File → Print .
4. In the Print dialog box, select the Postscript emulation printer.
5. Windows XP only: click Preferences .
NOTE
One custom paper size can be defined in the Windows
2000 and XP Postscript emulation driver.