Of course, they are not real windows.  You cannot see through them.  (At best, they are like paintings, i.e., flat, two-dimensional images painted on the surface of something opaque.)

Actual Windows would be a hazard and a liability in many serious applications.  (Some Windows certainly would not be suitable for anything upon which your life depends.)

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Recommended study: (  Sources so marked are not associated with WTCC.)
Carr, Albert Z. , "John D.Rockerfeller's Secret Weapon," New York: McGraw-Hill Book, 1962
Tarbell, Ida M., "The History of the Standard Oil Company," New York: Phillips & Company, 1904
Chez-Galore, Pat, "Reboot at 60 mph," Redmond: Expired Software LLC, 1998
Wear, M.I., "Bluescreen at 35,000 feet," Chicago: Single-Reader Book Publishers, 2000

UTLX, "Union Tank Car Company"
www.utlx.com/history.html, "The History of the Union Tank Car Company"
http://www.bilderberg.org/whatafel.htm, "Greed posing as philanthropy"
http://en.wikipedia.org/wiki/John_D_Rockefeller, "John D. Rockefeller family bibliography"
http://www.pbs.org/wgbh/amex/rockefellers/peopleevents/p_rock_jsr.html, "An American Experience"

The Windowed Tank Car Company is a member of the Corporate Corruption Consortium

Member in good standing of the a TIC Society affiliate.