How do I traverse the Querystring values in the REQUEST object?

I dont know how many or what name they are so I want to call then in a traverse. There are simple ways to do this in Perl and ASP.

Something like
<dtml-in "REQUEST.form">
 <dtml-var sequence-id> : <dtml-var sequence-value>
</dtml-in>

Well, I hope you know what I mean.

Thanks,
Tom