mplement <b>setBrightness:token:</b>.</font>

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<p><font face="Helvetica"><b>Writing Functions for the PostScript Driver</b></font>

<p><font face="Times">Besides implementing a subclass of IOSVGADisplay, you also need to write five C functions. One, named <b>IOSetSVGAFunctions()</b>, should fill in the structure it's passed with pointers to the other four functions. It should return zero on success. The other four functions correspond exactly to four methods that you must also implement; each fu