Hi -
Can someone explain the proper used of
M71 Invalidate Stored Modal State and
M72 Restore Modal State.

And why Is necessary to used them. I just starting using a CNC that has a 4th axis and I see some programming in it with small macros like:

N1T1M6(.136 DRILL)
IF[#10001LT-6.0]GOTO101
M8
S8000M3
M72
G0G90G54P6X-.606Y2.615A0
M71
G43Z3.008H1
G99G82Z.183R.255F8.P100
G98X-.861
G80G90M9
G49G53Z0M5
M1


Thank you in advance