Also take a look at the section "Creating Web-Enabled Scripts" from the following URL, this talks about how to create Static and dynamic web page as well as how the script populate values back to browser. The following info is from that section
"This sample script uses a static web page that prompts the user for a name and a dynamic web page that provides a template with an embedded keyword that is substituted dynamically by the script when it runs".
In response to your question, its the agents browser which interacts with the script.
It would be more clear if you understand the flow, IPCC Express uses Triggers, like a JTAPI trigger is used to initiate session from a Telephony Interface, here you will be creating a HTTP trigger which you will associate with the Application. Now this application will be using the script that you'll create. I am sure you would have got enough information from the above links about the HTTP Steps.
Here is a link which talks about creating a HTTP Trigger
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