Links for viewers:
Under the CSS unix machines
$ xv <filename>
will display an image file.
In a Linux machine, there might be the program called Electric Eyes which
would be invoked
$ ee <filename>
On the CSS Windows machines, just double clicking an image should bring up
a viewer. For Bitmap files, it will probably be MS Paint. For
other files, it will probably be some combination of Internet Explorer (.jpg,
.png) and MS Photo Editor (.tiff, etc), but only if it is installed correctly.
A very nice free Windows utility that supports all formats can be found at:
http://www.irfanview.com
To download it directly, go here.