Peter is a seminar leader and key course developer, teaching courses to thousands of software developers for Unix and Windows systems. As the chief developer and cofounder of the IT company Authensis AG in Germany, he has gained extensive experience in software development for computer telephony. Peter is also the author of several other books on software development in C/C++, most of them as co-author with Ulla Kirch-Prinz, including O'Reilly's "C Pocket Reference". Tony Crawford is a technical-writer and freelance translator with a strong C background based just outside Berlin, Germany. In addition to regular software localization projects, he has translated books on network administration and ATM. A US native, Tony completed undergraduate work at Occidental College, Los Angeles; Universit de Perpignan, France; and Technische Universitat, Berlin. Tony translates from German into English.