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The simplest way to specify the customized file is by placing
and <INPUT> tag in the HTML form.  For example:
<INPUT TYPE="hidden" NAME="brokerqueryconfig" VALUE="custom.cf">
Another way is to allow users to select from different customizations 
with a <SELECT> list:
        <SELECT NAME="brokerqueryconfig">
        <OPTION VALUE=""> Default
        <OPTION VALUE="custom1.cf"> Customized
        <OPTION VALUE="custom2.cf" SELECTED> Highly Customized
        </SELECT>