Introduction

Educated people need textbooks:
    A library is not always handy.
    Books organize and present what you have learned and more.
 
Class notes and handouts can be useful but:
    Easily lost or misplaced.
    Hand written materials difficult to read.

Today we use many media: Video, sound tapes, printed pages, internet.

Great convenience if all are put together on a Compact Disk.
    Easy to search.
    Low cost.
    Simple and cheap duplication.

Why use web pages?
 B A C K