WEL (Windows Eiffel Library)
WEL is an encapsulation of the Win32 Application Programming Interface (API), and provides users with a powerful means of creating Win32 Applications.
Getting started with WEL
If you are new to WEL, then the best place to begin is the tutorial, which consists of a series of samples demonstrating the development of a simple WEL system.
Also take a look at WEL common concepts for details of some common concepts used in WEL programming.