Re: Regarding computer screens...

Paul-
My web search provided the following information, and the sources are 
included.  I hope I am answering what you are asking:

XGA ==>
eXtended Graphics Array
 (XGA) An IBM display standard introduced in 1990.
XGA supports a resolution of 1024 x 768 pixels with a palette of 256 
colours, or 640 x 480 with high colour (16 bits per pixel).
XGA-2 added 1024 x 768 support for high colour and higher refresh rates, 
improved performance, and supports 1360 x 1024 in 16 colours. http://wombat.doc.ic.ac.uk/foldoc/foldoc.cgi?XGA (source)

XGA (Extended Graphics Array)
A Display Standard referring to a video adapter capable of a resolution of 
up to 1024 by 768 pixels.
SXGA (Super XGA)
A Display Standard referring to a video adapter capable of a resolution of 
up to 1280 by 1024 pixels.
SXGA+ (Super XGA+)
A Display Standard referring to a video adapter capable of a resolution of 
up to 1400 by 1050 pixels.
TFT (Thin Film Transistor) http://dret.net/glossary/ (source)
 http://www.cs.ndsu.nodak.
edu/~revie/amlcd/  is a good explanation for the 
TFT display details.

Good luck!!

de