How do I make a button panel that will change images on a laptop? Answered

As downunder35m already said, thats the simplest solution.
If you want to have something more fancy, you can go with a Arduino Pro Micro (ATMega34u2) and have it emulate a keyboard. Add 5 big buttons to 5 digital inputs and you are set.
https://www.arduino.cc/reference/en/language/funct...
&
https://www.arduino.cc/reference/en/language/funct...
for further reading into this topic.

Using an external number pad and a script for the viewer.