custom html tas and isapi filter functionality

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C++

IIS

Anyone can give me an example of a custom html tag functionality using isapi filters? I am looking for an example that helps to build isapi filter that provides the tag functionality. For example

my html page has a tag say <hellotag>Pass ths string to the isapi tag and print Hello on the browser page>

Isapi filter tag function to be in C++ for IIS

Thanks