Here are a few of the X client programs that your system may have:
resize : helps programs in xterm windows recognize new window size
xbiff : tells you when new electronic mail comes in
xclipboard : helps with copying and pasting text
xdpr : prints a window (with the printer)
xedit : simple text editor
xmag : magnifies parts of the screen
xman : browses UNIX manual (reference) pages
xmh : electronic mail program
xset : sets user preferences
For more information on those programs, see your online documentation or the O'Reilly X Window System User's Guide .