Tony Northrup, MCSE, MCPD, MCITP, CISSP, is a Windows and networking technologies expert who has written more than 30 books and video training courses. He is coauthor of Windows 7 Resource Kit and numerous Microsoft Press Training Kits for certification exam-prep.J.C. Mackin, MCITP, MCTS, MCSE, MCT, is a writer, editor, and trainer who's worked with Windows networking technologies for 10+ years. He has written several Training Kits, including for Exams 70-622, 70-643, and 70-685.