Features like scroll bars, launch buttons and stylus holders might be in the wrong place for you. The Avigo, Zoomer, Helio and Apple Newton all have their own proprietary operating systems. The third major system which is popular in Europe is EPOC from Symbian. Windows CE Microsoft released Windows CE for small devices like PDAs and set-top TV controllers. Wince is used as the OS on both handheld and palm devices from manufacturers like Hewlett-Packard, Philips, NEC, and Casio.
Wince comes in a regular version and a Professional Edition for Pro handhelds.
Wince PDAs can be made to work with a Mac or Linux computer, but it requires third party software and hardware. If you want a PDA with a built-in keyboard, there are none that run Palm OS, but you can get an external keyboard for some Palm PDAs. This OS is used for mobile wireless devices like smart phones, as well as PDAs. In many ways, this OS resembles Windows and is fully Windows compatible. However, EPOC tends to run faster and use less power than Wince.