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Include the following text in your HTML to see the client's environmental variables:




Which will appear as:
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You can access any of the variables in JavaScript space by calling something like the following:
<SCRIPT>
  document.write(HTTP_USER_AGENT);
</SCRIPT>
Note: if the environmental variable has anything other than letters and dashes in it, it will be turned into underscores. Also note I removed the HTTP_REFERER since it will always be whatever page you're calling this from as that's what my server sees (you can call the real referring URL from JavaScript space).