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Elna R.Tymes and Charles E. Prael have teamed to write dozens of books about computers and software since the mid-1980s. They maintain an active consulting practice working with Silicon Valley companies on program development, writing, and training. Working with their company, Los Trancos Systems, they have developed a video server for Stanford University, stand-alone training material for Oracle and other Silicon Valley companies, and documentation sets for companies such as Genentech, Apple, and Sun.