A CGI script that returns nothing?

For reasons that are completely convoluted, I need to alter a Perl CGI 
script such that when certain parameters are passed to it the script 
returns nothing to the browser: no headers, no HTTP codes, no nothing.

I'm really stumped, and I'm not sure that I should be since it seems on the 
face of it to be a pretty simple task to do nothing.  It's just that I've 
never been asked to do this before.  The obvious attempts ("exit if $param" 
type things) don't work (500 error, bad headers, as you'd expect).  I 
wanted to use an nph script, so I could control the headers, but I can't 
for various reasons.

So how do you do it?  Can it be done?  Is there a way to do it in Apache 
(1.3.9 on Solaris)?

I appreciate the help greatly.

-B

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