Windows CE  - (Windows Compact Edition) - Released in September 18, 1996, Microsoft Windows CE is a 32-bit real-time embedded operating system (RTOS.)  It's a version of the Microsoft Windows operating system designed for small devices such as personal digital assistants (PDAs), handheld PCs, certain set-top boxes, digital versatile disc (DVD) drives, entertainment consoles, smart phones and other appliances with computers built into them.