David A Solomon, president of David Solomon Expert Seminars, Inc. (www.solsem.com), teaches Windows 2000 internals to corporations worldwide. Previously, he was a lead developer on the VMS operating system at Digital Equipment Corporation. Mark E. Russinovich is the author of the Sysinternals Web site and cofounder and chief software architect of Winternals Software (www.winternals.com), specializing in advanced systems tools for Windows 2000. He writes the "Internals" column in Windows 2000 Magazine. Formerly at IBM Research, Mark holds a Ph.D. in computer engineering from Carnegie Mellon University.