Animation Beginner- How did they do this?

How did they set up the hands to be able to move all around and change angles like this:

I’ve tried messing around with it, but it never does what I want. Can anyone please give me some tips?

Pretty sure it’s done by moving around the IK effector to the location of what ever button is pressed.

Here’s the documentation for doing IK stuff:

But instead of doing a trace to hit a surface, they probably just move the effector to the location of the key when a keypad button is pressed.

IK target with a hand position