These days with the aid of modern implementations and devices citizens are allowed to facilitate and brighten up their life as never before. Now we will mention pocket digital assistant, also called iphone software which is one of them. Because PDA is a pure computer no features of the telephone are represented in it. Reproducing video files, music files, serving the purpose of a pocket book, working with text editors and other kinds of useful software are the peculiarities of it. So if you’re a sort of an active person that doesn’t want to diddle away their time while removals, the PDA would be certainly handy for you. At the time of lengthy tours one can amuse your leisure watching a picture, looking through a book or utilizing pocket pc with the aid of suitable pocket PC. Assent that to have by you a thick magazine is more inconvenient. This facility becomes much more valuable if you remember that the PDA may enclose more than one book or game. Making note that the gadget is multitask, you may listen to music while reading a magazine. You may also write in the seeking bar Mobile games, if you would like to obtain plays in your PDA.Each PDA is supplied with the OS (operational system). Speaking about operational system you can decide upon among PalmOS, Microsoft Windows Mobile and Linux. The advantage of Linux is that it’s got gratuitous tools, though most users are more familiar with Windows. As designers designed PalmOS especially for the PDA, it is simple to operate. But be aware of probable faults in case of simultaneous usage of a couple of programs. Though the choice of the OS is rather crucial, you shouldn’t also neglect such essential points as computer horsepower, input medium, volumes of permanent memory and main memory, screen size and whether the memory can be expanded or not.Power demand is the problem of each PDA. Just now no maker may take pride in high effects in this sphere.