i even try this:
local bb= mc.mcCntlSetPoundVar(0,5021,250)
local aaa = mc.mcCntlGetPoundVar(0, 5021)
val = string.format(aaa)
val2 = string.format(bb)
mc.mcCntlSetLastError(0,val)
mc.mcCntlSetLastError(0,val2)
and i can see that its show on the history that its change the value
but actually its didnt change it
and machine coordinate remind as its was before