<meta http-equiv="content-type" content="text/html">

- tells the browser it's a html page

<meta http-equiv="expires" content="0">

- tells the content expires immediately (although this is also sent with the
header and can there be set through the webserver or server side scripting
language).  It can be interpreted by the browser and it's also a guideline
for the search engine bots when to revisit the page.

<meta http-equiv="pragma" content="no-cache">

- tells the browser not to cache the page on disk

<meta http-equiv="cache-control" content="no-cache">

- tells the browser not to cache the page on disk

- So... some things actually mean the same.  This is because different
browsers act differently on different tags.  The pragma thing is supported
by IE, though I think not NS.  Cache-control is specific for NS.

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