Web programming to help bank with misprinted marketing material

A few years ago, we got a call from someone we knew who worked at a large bank.  They had just realized that there was a mistake in the material for a large marketing campaign.  The marketing material, which had already been mailed out, pointed to a URL like http://www.largebank.com/OfferA.  The problem was that the website was actually http://www.largebank.com/OfferB.

Within 4 hours of their initial call to us, we developed and delivered to them an ISAPI filter that they could load on their webserver that would automatically redirect someone who typed in the wrong address to the correct address.

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