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Answer Posted / guest
Many browsers identify themselves when they request a
document. A CGI script will have this information available
in the HTTP_USER_AGENT environment variable, and it can use
that to send out a version of the document which is
optimized for that browser.
Keep in mind not all browsers identify themselves correctly.
Microsoft Internet Explorer, for example, claims to be
"Mozilla 1.2" to get at Netscape enhanced documents.
And of course, if a cache proxy keeps the Netscape enhanced
document, someone with an other browser will also get this
document if he goes through the cache.
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