XSET: EASY solution to enhance batch files.
Put ANYTHING you want in environment variable
*Catch output of any command or program.
*High-level user interface: line-edit, colors
 windows, boxes, time-out, default values,...
*Built-in commands to modify strings: search,
 subst, lower/upper, substring, regular expr.
*Calculation, system data: date/cpu, filename
*Manage var. (like PATH) longer than 128 char
*And much more ! (password, random, ...)
