Here is a bit of info that I've learned from several helpful respondents:

>From Jason Wallin, a good URL:

>There's an (quite simplistic, non-technical) answer at:
><http://www.mcp.com/838339200/1-56276/1-56276-441-1/ch15.htm>
>This is chapter fifteen from ~How Intranets Work~ by Preston Gralla [1].

(note, this is specifically about Intranets, but if you think in terms of
an ISP's clients being on an Intranet with the ISP, it makes sense in terms
of the kind of problem my client is experiencing.)

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>From Bill Houle, several comments and a solution to use on my web pages:

> I'm not too sure you have anything to tell them, other than to go
> bug the providers of the proxy service and not you.

> If both sites were designed to do the same exact thing -- no
>"Pragma: no-cache" or "Expires: <date>" headers in one version and
> not the other -- then the behavior of the proxy is entire beyond your
> control. There's nothing you could be doing that would affect what
> they see.

> BTW, I use a proxy service and could see no differences. Of course,
> I just now visited and wouldn't have your sites in the cache anyway,
> so that doesn't prove much.

><Both Pragma and Expires headers are HTTP-EQUIV meta tags:
><META HTTP-EQUIV="Pragma" CONTENT="no-cache">

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Suzanne Stephens, Stephens Design; Ashland, Oregon
541-552-1192  http://www.KickassDesign.com/
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