May 1994 / Features

Extensible Software Systems	Making software fully extensible means you can mix and match code modules at run time, without recompilation - by Dick Pountain and Clemens Szyperski
Subtyping Or Subclassing?	Inheritance and polymorphism are important concepts in OOP (object-oriented programming), but more subtle distinctions are usually not explained.
Inheritance or Delegation?	To illustrate the difference between inheritance and delegation, consider the following code, which implements a rather poorly designed class called printer that supports the printing of documents: Printer = POINTER TO PrinterDesc; PrinterDesc = RECORD pageno: INTEGER; (* variable is private *) PROCEDURE (p: Printer) PageNo(): INTEGER; PROCEDURE (p: Printer) SetupNextPage (VAR endOfDoc: BOOLEAN); PROCEDURE (p: Printer) PrintPage; PROCEDURE (p: Printer) PrintDoc; END; (The language used here is Oberon-2, whose sy ntax bears a family resemblance to Object Pascal.
The Computerized Patient Record	Huge benefits in the quality of health care along with financial savings center on a broadly accessible computerized patient record - by Scott Wallace
Desktop Data Conferencing Teleconferencing Options Telecommunications And Speech Coders	Data conferencing might be the first "killer" multimedia application - by Andrew W. Davis
The High Cost of Videoconferencing Video Bandwidth Requirements	Rising transportation costs and the time-wasteful aspects of travel have focused corporate attention on expensive broadcast-quality videoconferencing systems.
DSPs and the PC Mainstream	DSPs (digital signal processors) are not new, even to desktop computers.

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