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If you are deploying on Windows then yes: IIS it is. You can use Apache if you make your web server an OSX box.
Delivery to the browser is entirely done by IIS so nothing special there. What kind of details is he after for how data flows between the FMS database engine and the web server? Encryption? Ports?
He was curious to know exactly what in the IWP application requires IIS. I get the feeling he has reservations about IIS, or there are extra steps he has to take in our environment to make it play nice with everything else we host.
We use Apache to handle most everything that comes in via IP/TCP.