Wipes free space on the selected drive, clears cookies, temporary internet files, file access history from the registry and recent folder. Some of the power user features are select additional directories you want to wipe, registry keys you want to clear, cookies you want to keep, number of patterns to write to free space and registry entries before clearing and the thread priority of the free disk space wipe. For NT/W2K and XP a miscellaneous tab will be displayed that will give you the option of deleting locked files and relocating the SAM file.