Following are a few standard X window programs that your system may have:
xbiff: tells you when new electronic mail comes in
xclipboard: helps with copying and pasting text
xmag: magnifies parts of the screen
xman: browses Unix manual (reference) pages
For more information on those programs and the many other standard X programs, see a reference file or book. There's a list of the X programs that come with XFree86--and, in general, with other X Releases too--at (as of this printing) http://www.xfree86.org/current/manindex1.html.
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