ch03 contains the following example programs:

xrowcolumn:	a simple XmRowColumn containing PushButtons

xform:		a simple XmForm containing PushButtons

xmainwindow:	an XmMainWindow, with a menu bar, a File menu containing 
		quit, and a Help menu containing a help button that posts 
		a dialog -- both menus have tear-off behavior enabled

Ex3-8:		example 3-8 from book -- passing a number to a callback 
		through client_data

Ex3-9:		example 3-9 from book -- passing a structure to a callback 
		through client_data
