You can dry run / simulate a file in Mach with no machine movement if the controller is disconnected from the PC ( PP cable not attached), or the motors are disengaged, or if the PP port is not defined in Mach. Simply put, if the pulse stream from the PC is not going anywhere.
I think that is what you are meaning.
LC posting / use is still restricted as noted in my other reply. If unlicensed then you will get an error if you try to do a pocketing for example.
RICH