 control device.</font>

<p><font face="Times">The <i>aSelector</i> method should not have a significant return value and should take a single argument of type <b>id</b>; <i>anObject</i> will be the argument passed in the message.</font>

<p><font face="Times">If <i>flag</i> is YES and another <b>perform:with:afterDelay:cancelPrevious:</b> message is sent to the same receiver to have it perform the same <i>aSelector</i> method, the first request to perform the <i>aSelector</i> method is canceled.&nbsp; Thus