These options control what TkGate should do when the user clicks on
certain hyperlinks in their circuit.
<ul>

<li><b>Browser Command:</b> Specifies the command to use when the user
clicks on a hyperlink starting with "http:".  Normally this should
point to the user's browser command.  A "%s" in the command will be
replaced with the text of the hyperlink the user clicked on.

<li><b>e-Mail Command:</b> Specifies the command to use when the user
clicks on a hyperlink starting with "mail:".  Normally this sho