As handheld computers, PDAs have processor and operating system like a normal computer. This operating system is the main software on your PDA. How it works just like on a computer operating system like Windows XP, Mac OS, but designed specifically for PDAs. There are two common PDA operating system on the Palm and Pocket PC (Windows Mobile). Both work with different software programs, so even though contains many documents such as pictures, music and other measures that could be used but not in programming. In data storage without katru memory, stored in dozens of megabytes of RAM with size, while its energy sources coming from the battery (formerly A3) refill. Also could also use an adapter which is connected kestop AC contacts.