getRequestDispatcher()

[Kesavulu Thalachiri]

Hi,
Please any one can explain of my following doubts.Iam new to servlets and jsp.

A)servletContext.getRequestDispatcher();
B)servletRequest.getRequestDispatcher();
C)HttpServletResponse.sendRedirect();
D)<jsp:forward >

Questions:
1) Explain the above functions usage in tech terms.
1) What is the difference between A and B?.
2) What is the difference between D and forward of (A or B)?.
3) What is the difference between C and D?.

[David O'Meara]

This is a duplicate of a post in the Servlet forum.
Please answer the question in this thread
thanks,
Dave