OEMs and enterprises are able to customize the logon screen wallpaper of Windows 7 that is displayed before a user logs on. Managing gadgets is more closely integrated with Windows Explorer, but the gadgets themselves continue to operate in a separate sidebar.exe process. The Desktop context menu includes a new "Gadgets" menu option to access the gadget gallery, and a "View" sub-menu option to show or hide gadgets. Hiding gadgets results in the sidebar.exe process being unloaded, which Microsoft says is a power-saving practice. Unlike Windows Vista, all gadgets run in a single process, which saves memory, and the process is not run at all if the user has no gadgets on the desktop. Windows Vista introduced Gadgets and a sidebar which provides the ability to anchor Gadgets to the side of the user's desktop. In Windows 7, the sidebar has been removed, while gadgets can still be placed on the desktop. Windows 7 adds a Windows Media Center gadget to the default collection while removing the Contacts and Notes gadgets. Windows 7 includes a desktop slideshow that changes the desktop background in a designated amount of time with a smooth fading transition. This feature supports pre-downloaded sets of wallpapers and also supports photo RSS feed. Windows 7 retains the Windows Aero user interface and visual style first introduced with its predecessor, Windows Vista, but many areas have seen enhancements. Some of the new features included in Windows 7 are advancements in touch, speech, and handwriting recognition, support for virtual hard disks, support for additional file formats, improved performance on multi-core processors, improved boot performance, and kernel improvements. Windows Explorer in Windows 7 supports file that aggregates content from various locations - including shared folders on networked systems if the shared folder has been indexed by the host system - and presents them in a unified view. The libraries hide the actual location the file is stored in. Searching in a library automatically federates the query to the remote systems, in addition to searching on the local system, so that files on the remote systems are also searched. Unlike search folders, Libraries are backed by a physical location which allows files to be saved in the Libraries. Such files are transparently saved in the backing physical folder. The default save location for a library may be configured by the user, as can the default view layout for each library. Libraries are generally stored in the Libraries special folder, which allows them to be displayed on the navigation pane.
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