This program illustrates how to turn the CUWIN's LCD Backlight on and off with code.
* It works by calling the Windows API function SetDevicePower - http://msdn.microsoft.com/en-us/library/aa918190.aspx
Calling a Windows API function is done using a technique called "Platform Invoke" or "P/Invoke" for short - http://msdn.microsoft.com/en-us/library/aa446536.aspx
* C# and VB.Net projects are attached.