Hi, I have never programmed in Java before. Mostly I do numerical and
statistics programming and my main tools are C++ and Matlab. So please
tolerate me if my questions look a bit dumb.

I am going to teach a college course and I want to do real time
presentation on website, so if one of my students can't come to campus
during class hours she can just log onto the course webpage  and see /
hear exactly what I am talking about.

I want my course page to have following functions:

1) There is an area(window) on the website showing the powerpoint
slides I am showing in classroom.
2) I will have a microphone with me and the remote student can also
hear me real time.
3) When I click on an embeded item on powerpoint pages, for example,
an Excel sheet, the Excel sheet shows in the window.
4)There is also an instant messenger window on the webpage, so student
can type in her questions and I will see it instantly.
5) If I need to demonstrate the computation steps I will write on a
writing pad and the student can see what I am writing, which is like
writing on a blackboard.
6) All these can be recorded and be replayed later.

this looks like a web conferencing tool but I haven't find one which
is both free and having all the functions I need. Also I want all
these thing be embeded on a webpage and the students don't have to
install any additional program on their comptuers. They can simply use
any computer in the lab, go to my website and instantly begin the
class.

So my questions:
1) Can all these things be done in Java? If yes, what kind of library/
technology I should use?
2) Is there any other language / toolbox /system doing this kind of
thing better?
3) Any related book / online tutorials ?
4) Are there already some free program \ toolbox providing all the
functions I need?

Thank you very much.

Yiyu