is enabled, users can switch to the Classic logon by pressing Ctrl+Alt+Del twice at the Welcome screen. Windows Installer Windows XP introduced Windows Installer (MSI) 2.0. Windows Installer 2.0 brought major improvements such as installation and management of side by side and CLR assemblies, sandboxing MSI custom actions, improved event logging and hiding sensitive information in log files, per-user program isolation, digital signatures, improved patching (more robust patch conflict resolution and reduced unnecessary unversioned file copying and source prompts), Terminal Server support and integration with System Restore and Software Restriction Policies. Windows XP can be updated to Windows Installer 4.5. Disk Defragmenter Windows Disk Defragmenter was updated to alleviate several restrictions. It no longer relies on the Windows NT Cache Manager, which prevented the defragmenter from moving pieces of a file that cross a 256 KB boundary within the file. All parts of a stream including the cluster boundary for non-compressed files, reparse points, bitmaps, and attribute_lists, NTFS metadata files, EFS-encrypted files and the NTFS Master File Table can be defragmented. The defragmenter supports NTFS volumes with cluster sizes larger than 4 kilobytes. A command-line tool, defrag.exe, has been included, providing access to the defragmenter from cmd.exe and Task Scheduler. Users who are members of the Power Users group can schedule defragmentation. Windows Task Manager Windows Task Manager incorporates a number of improvements in Windows XP. It has been updated to display process names longer than 15 characters in length on the Processes tab, which used to be truncated in Windows 2000. Session ID and User name columns have been added on the Processes tab. The Delete key can also be used to terminate processes on the Processes tab. A new Networking tab shows statistics relating to each of the network adapters present in the computer. By default the adapter name, percentage of network utilization, link speed and state of the network adapter are shown, along with a chart of recent activity. More options can be shown by choosing Select columns... from the View menu. The Users tab shows all users that currently have a session on the computer. On server computers there may be several users connected to the computer using Terminal Services. There may also be multiple users logged onto the computer at one time using Fast User Switching. Users can be disconnected or logged off from this tab. A Shutdown menu has been introduced that allows access