A Note about Typography

Some typographic conventions used in this book should be noted.

• First, a word about script annotations: Sample scripts are often accompanied by notes in the left-hand margin. For convenience each note is numbered, with a corresponding number shown at the end of the relevant line of code.

• In the sample scripts, system output is indicated in bold type.

• In the text, bold type is used to indicate key terms being defined.

”Richard  Staron
Mansfield  Center,  Connecticut
July  2002