1). IIS is Microsoft stuff and it does not support servlet and Jsp;
2) URI means Universal Resourse Identifier.
If you see "http://www.xyz.com/eshop/servlet/chatroom?name=John", "eshop/servlet/chatroom" will be URI.
3) Simply speaking, you should put all things under C:\jakarta-tomcat\webapps\. For such things, you should study Tomcat documentation.