environment variables

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I have home pages, and on each one, i used to have a "back" and "forward"
button as imagemaps. My problem is that imagine i have 3 pages named A, B and
C.html that lead to a D.html page; on the last one, the "back" button *must*
know which page the user came from...
Is there an environment variable to describe such a situation?

Thanks in advance

Emmanuel Ponsardin

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