Some parts of this file are derived from the example code from the book:

Object-Oriented Programming with C++ and OSF/Motif
by Douglas Young
Prentice Hall, 1992
ISBN 0-13-630252-1

Copyright 1991 by Prentice Hall All Rights Reserved

Permission to use, copy, modify, and distribute this software for any purpose except publication and without fee is hereby granted, provided that the above copyright notice appear in all copies of the software.
