Mod rewrite problem

is it possible to use this rewrite rule to call a cgi script:

RewriteRule ^xredirect:(.+) /path/to/redirect.cgi/$1and when the
redirect.cgi script gets the request, decline it so that another rewrite
rule could be used or the document orignally called could be sent.How would
you decline the transaction with the script.I'm trying to use mod rewrite to
run a script for each request so that I can record user information.I want
to track a users file usage.
Thanks John Michael