Introduction to Computers
© Morris Firebaugh
A. Introduce Chapter 13: Database Management Systems
B. Database Concepts
C. Concept of Hypermedia
E. Introduce HyperStudio Stack Design
1. Uses Customer File to determine that Computer City --> CUST-NO=3007
2. Uses Order File to look up ITEM-NO --> 7639
3. Uses Inventory File to look up Item 7639 to read QOH (Quantity On Hand) = 0
4. Returning to the Customer File, the Moore rep referrs the Computer City customer to their sales rep Pat Sulliven, using the REP-ID link, and gives them her number.
One of the most wonderful properties of a computer is that no matter how many dimensions one's information has, a computer representation can always supply at least one more. One result is that any seeming distance between items in our world of limited dimension can be completely "disappeared."
This is something that Vanevar Bush and his chief prophet Doug Englebart noticed immediately, and hypermedia was born. In the world of Dynabooks, information will not be printed-it would destroy most of the useful associations-and something much more than superpaper will emerge. The notion of hypermedia is much more a "user illusion" than a "metaphor."
That wonderful system, HyperCard, in spite of its great ideas, has some "metaphors" that set my teeth on edge. Four of them are "stack," "card," "field," and "button."
Hypermedia. It's a new word for most of us. Yet this term and its definition will become increasingly important the more we rely on personal computers to store, manage, and retrieve information.