ch09 contains the following example programs:

xfileinput:	gets input from file using XtAppAddInput; invoke with 
		filename command-line argument

xpipeinput:	gets input from pipe using XtAppAddInput; specify on 
		command-line any program that prints characters to standard 
		out (xpipeinput "cal 10 1989")

xstdin:		gets input from pipe from stdin

xworkproc:	uses a work procedure to create a popup widget using 
		idle time

