Quoted from wayout440:
I would also like to mention that a lot of digital simulations of pinball also include the ability to nudge as a part of the programming.
A good quality virtual pinball machine will have an nudge sensor (accelerometer) installed that allows you to move the table around and affect the ball. My cabinet also has a tilt sensor (plumb bob) installed, so the game will let you know if your to rough.
Just a question for the non-nudges. What do you do if the ball stops and gets stuck somewhere? Do you wiggle it free, or just stop your game. give up and take the glass off.