Cisco IP Phone Services - Dynamically Generate XML pages

Question

I am new to Cisco IP Phone Services (IPPS) and I am still trying to understand the concept behind it. I am a application developer, so I have much experience in web development either.

I have been looking at the Singlewire documentation from here: http://www.singlewire.com/free-xml-apps.html

Here is my understanding so far: The phone menus are in XML form, and when user select a menu, it is directed to another XML depending on the user input.

For example, The XML page for the StockQuote is:

<CiscoIPPhoneInput>
    <InputItem>
        <DefaultValue/>
        <DisplayName>Ticker Symbol</DisplayName>
        <InputFlags>A</InputFlags>
        <QueryStringParam>sym</QueryStringParam>
    </InputItem>
    <Prompt>Enter the ticker symbol</Prompt>
    <Title>Stock Quote</Title>
    <URL>http://www.singlewire.com/cgi-bin/stockquote.pl</URL>
</CiscoIPPhoneInput>

If the user input is CSCO, then it somehow generate the following page with XML in it: www.singlewire.com/cgi-bin/stockquote.pl?sym=csco

My questions: 1. After the user entered CSCO, how does the service know to go to the link www.singlewire.com/cgi-bin/stockquote.pl?sym=csco? 2. I am thinking stockquote.pl is a perl program that generates XML code base on the parameters "?sym=csco". I will be programming in .NET with Visual Studio. How can I create a stockquote.asp that dynamically create XML by looking at its parameters?

Thank you, Lex