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Charles J. Brooks (A+, Network+, I-Net+, Server+, HTI+, MCP) is currently co-owner and vice president of Educational Technologies Group Inc., as well as co-owner of eITPrep, LLP, an online training company. He is in charge of research and product development at both organizations. A former electronics instructor and technical writer with the National Education Corporation, Charles taught and wrote on post-secondary EET curriculum, including introductory electronics, transistor theory, linear integrated circuits, basic digital theory, industrial electronics, microprocessors, and computer peripherals. Charles has authored several books, including the first five editions of A+ Certification Training Guide, The Complete Introductory Computer Course, and IBM PC Peripheral Troubleshooting & Repair. He currently also writes about networking, residential technology integration, and convergence.