Just wondered how you guys learned the Windows API. I'm reading Programming Windows, Fifth Edition by Charles Petzold right now. So far it seems to be a pretty decent book as far as programming goes.

This article is published by AllBusiness.com, a partner of TIME. What are "APIs?" An API (Application Programming Interface) is a set of protocol routines, and tools for building software.

An application programming interface (API) is software that acts as an intermediary between two programs, helping them exchange information.