Possibly an overly paranoid approach but the way I would do this is to create a file on the server (outside of the webserved directory tree) with some content and record its md5 sum. Then in your CGI script check for the existence of that file and that the md5 sum is correct.
-- Murray Barton Do not seek to follow in the footsteps of the wise. Seek what they sought. -Basho
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