TAG explanation?

Can someone explain each of these tags (used on the freeway site) as to what they do -and what/if/why I should incorporate them into my own sites… and what advantage they might provide.

meta http-equiv=“Pragma” content=“no-cache”

meta http-equiv=“cache-control” content=“no-cache,no-store,must-revalidate”

meta http-equiv=“expires” content=“-1”

meta http-equiv=“imagetoolbar” content=“no”

thank you

TODD


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The first three:

Then the fourth one:

“Image Toolbar” is a IE6+ specific feature designed to facilitate the handling of images on your site. As a user moves his mouse over an image on your page in IE6, a rectangular toolbar pops up, allowing for the instant saving, printing, and emailing of it. As the publisher, you may wish to disable this feature, so your site’s images are not so readily exposed to manipulation."


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Great thanks-- very clear now…


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