David E. Ross wrote:
On 3/21/11 4:50 AM, Arne wrote [in part]:

The last option "When the page is out of date", what does that really
mean, in the way SM "see" it? Is that a better option than the "Every
time ....." option, in my case?

Some HTML files contain a header with an expiration date-time.  A cached
page is "out of date" when you attempt to display it from your cache
after the expiration.

Here is an example of such a header declaration:
<META HTTP-EQUIV="expires" CONTENT="Wed, 26 Feb 1997 08:21:57 GMT">


Holy smoke! I didn't know about that.  That date/time looks familiar,
but I can't quite place the call?-)


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