Computer hardware, namely, personal digital assistants (PDA); computer software for use as an address book, for use as a scheduler, for use as a date book, for use as a calculator, for use as a dictionary, to enable transmission of data between a personal digital assistant and a personal computer, for use as a web browser, to automatically check registered domain names and store their content on a personal digital assistant or a personal computer, to provide e-mail services, for use as an image viewer, to manage image files, to allow subscription to an Internet service provider, to enable transmission of data between a personal digital assistant and IC recording media, for playing games, and for use as an audio recorder/player, all for use with personal digital assistants; peripheral devices for personal digital assistants, namely, an input stylus, a USB adaptor to connect a personal digital assistant to a personal computer, USB cables to connect USB adaptors and personal computers, a mobile communications adaptor to connect a personal digital assistant to a mobile telephone, cables to connect mobile communications adaptors and mobile telephones, AC adaptors, and leather cases for carrying personal digital assistants