Compatible Components

This is what Software is: Components that work together easily.

Software Developers (the people who use these things) ask only one thing of them: how well do they work with other Components? 

They have to work with people also and have a good User Interface (UI), but that is secondary. The main thing is Computers, how does it work with them?

This even applies to Software Developers (Programmers). How well do the apps they write, work with the Computers they were written for?