[XeTeX] XeTeX documentation? (from "Checking if a font exists")

[Michiel Kamermans]

Hi Khaled,

"texdoc xetex" only generates a man page style html file for the xetex 
command line program when I run it. I was more enquiring about the 
existence of  normal application documentation. I.e., which commands are 
supported by XeTeX, how do you do certain things in XeTeX, which things 
that you might be used to doing from TeX/LaTeX *shouldn't* you do in 
XeTeX, etc.

- Mike