I. are there any other scopes?
Application scope. You can use ServletContext to set attributes, which will be available for al
servlets.
II. can you give an example where you'll use request.setAttribute("A", objA);
As I said in the first post, when you want to pass a variable needed by a jsp file.
For example, a list of employees. You could put the list in the request, forward to a jsp, and display the list.
III. What if I wish to set an object AA to all users?
Same as question I