I know M3 had the capability to use a Touch Screen , does M4 ?

Hi,
yes. A touch screen is a function/feature of your PC, Mach3 or Mach4 don't actually have to do anything. I recall seeing some posts where someone
had made a screen especially for touch screens, the buttons were bigger. M ost standard screens are so jam packed with buttons, Dros, Leds etc that
you touch the screen and could be indicating several items, not just the one you intended.

Hi,
Graham posted this only a few weeks ago, might be just the ticket for you;
http://www.machsupport.com/forum/index.php/topic,35438.0.html

Craig