ack-and-white device for 1-bit monochrome displays.

<dt><b>x11gray2</b>
<dd>This is a device for 2 bpp (4-level) monochrome displays.

<dt><b>x11gray4</b>
<dd>This is a device for 4 bpp (16-level) monochrome displays.
</dl>

<h3><a name="display_device"></a>display device (MS Windows, OS/2, gtk+)</h3>
<p>
The <b><tt>display</tt></b> device is used by the MS Windows,
OS/2 and the gtk+ versions of ghostscript.
</p>

<h4>Options</h4>

<p>The display device has several user settable options.</p>

<blockquote>
