Hi,
still not to sure that its not getting garbled in transmission. It sounds like you want Mach to stop you from going outside a certain area?
This can be done already...it called Soft Limits. For soft limits to be effective you have to reference your machine to an exactly known location and you can repeat that
location every time you start Mach. It is usually done with Home switches.
Once your machine is homed (referenced) then the soft limits are the area where Mach is safe to go but is unsafe to go outside of. If you have soft limits enabled
then it will stop and not let you go out of the safe zone.
Does that sound like the sort of thing that you want Mach to do?
Craig