small doubts

Hello Group,
     Hai! I just have small doubts in the case of Servlets:

--->> Are the HttpServletRequest and HttpServletResponse....the classes or
the interfaces?

--->> What is the difference between the forward() method and the include()
method which are the methods of the RequestDispatcher interface?

--->> What is meant by web.xml file? Why is this file required?

--->> When we deploy the HTML file and a servlet in the J2EE1.2.1 web
server where are these files stored? I mean to question... where are the
html files and the class files stored after the deployment(in the case of
J2EE1.2.1)?

Please help me out...
bye
cheers,
suresh

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