Also, I don't understand the claim "between all of your displays you can only have 32,768 pixels". A 1920x1080 screen has over 2 million pixels (2073600 to be precise). Can anybody explain that part?
Coordinates in the X protocol are signed 16-bit so a screen can run from 0 to 32,767 along an edge. I agree though, the initial complaint is unclear and may be about something else.
Thanks for clarifying. So the following complaint about DPI does not make sense, given that a 50 inches wide screen with a resolution of 600 pixels per inch has 32000 pixels.
OK, I've gone and read the OP's text rather than just the quoted part. It seems he's talking about combining multiple X screens into one logical coordinate space, like I expect one or more of the existing extensions do, e.g. Xinerama.