n with one of the names listed below, then the option has exactly the effect described below.</p>
  
    <p>In the descriptions below, &#8220;Command-Line Name&#8221; refers to the switch used in class commands and configure widget commands to set this value. For example, if an option's command-line switch is #:foreground and there exists a widget #&lt;widget>, then the command</p>
  
    <pre>
(#&lt;widget> &#8216;configure #:foreground &#8216;black)
</pre>
  
    <p>may be used to specify the value black 