Oki ES2426dn Reference page 86

Printer Halftone
This option prevents the halftone of a high-end graphic application
from printing. Click the checkbox to enable the option.
Color Simulation
Affects CMYK output only and is usually used in offset printer
environments only.
This option simulates what the output will look on a printing press
using the ink types SWOP, Euroscale or Japan. If using CMYK Ink
Simulation, it is recommended that you switch off all other Printer
Color Matching by selecting the No Color Matching option under
the Color Match option in the printer driver.
Separations
This option affects output only, allowing you to print all colors or
separate plates.
You must select a non-generic PostScript Printer
Description (PPD) file for a printer that supports color
separations.
ColorSimulationOSX.jpg
SeparationsOSX.jpg
NOTE
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PrinterHalftone.jpg