i started with the 'stock'  mach4 mill
i put this line of code into the top of the startup screen load script just before the two functions

local x  = mc.mcGetInstance();
wx.wxMessageBox('screen load instance was '..tostring(x))

it always 'pops up'  6 times, instance 0 to 5 . .
whats up with that ! ?

Currently, (even though not functional yet), Mach4 can run 6 instances.
So, perhaps it is looping through the 6 possible instances, even though only instance 0 is currently supported.

Scott

thanks again, man