I have connected HIDKeys and Mach3. It's works. But not all is pleasant to me. I am sorry for my English, therefore I have made video.
http://www.youtube.com/watch?v=pwHVTDoG2Ig
First time by button pressing all works perfectly. Through some pressing the button I see, that reaction time increases. Then Mach3 ceases to react to the button.
In what there can be a problem? What it is necessary to change in the source code? If it is possible, set a change example.
I connected USB numpad and Mach3, but such problem did not arise.