har *)<i>command</i> <b>data:</b>(void *)<i>data</i></font></td></tr>

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<td><font face="Times">This method performs arbitrary control operations; the character string <i>command</i> is used to select between these operations. Although you don't have to implement any operations, there are five standard operations. You can also define your own operations.</font>

<p><font face="Times">The standard commands are listed in t