http://ru.wikipedia.org/wiki/%D0%A2%D0%B5%D1%80%D0%BC%D0%B8%D0%BD%D0%B0%D0%BB%D1%8C%D0%BD%D1%8B%D0%B5_%D1%81%D0%BE%D1%81%D1%82%D0%BE%D1%8F%D0%BD%D0%B8%D1%8Fhttp://www.it-med.ru/library/t/terminal.htm