xhello is a simple hello world program using Label widget.

xgoodbye is xhello with callback on PushButton widget

xsetstring demonstrates how to use XtVaSetValues and how to set
a compound string in the code.

xgetstring demonstrates how to use XtVaGetValues and how to get a 
compound string in the code.

xcomstring demonstrates creating compound string segments and
modifying fonts in the middle of a compound string using character
sets.
