Variable input during automatic operation

Is there any practical method to input a variable while a g-code program is running? For example Pause, Request input, Resume, and then use that input.

Currently using 2.8.4 with the Axis interface.

I know multiple ways to change variables when a program is not running, but I have never seen any method for temporarily modifying a running program.

This would allow a single program to process workpieces with different sizes, for example.

I understand this could be dangerous, stupid, or worse. Not planning to be a pioneer.

I searched the forum and the documentation, and I could not find any mention of this topic.

Gene

Create a (physical)button, so you can read pin signal, and if 0 do... if 1 do...?
There is no parameter screen where you can watch/change parameters, would be nice do.

Could you elaborate what you want to change while milling?
Only thing i could think of is change off depth?

Found this post,  sounds similar to what you need.

As I said, change of workpiece length, or as you say, change of depth.

See
www.forum.linuxcnc.org/20-g-code/53837-u...custom-m-code#310053
which refers to this:
forum.linuxcnc.org/20-g-code/33642-custo...ython?start=0#102549

Thanks! That does it.