Microsoft Gadgets are lightweight single-purpose applications, or software widgets, that can sit on a Microsoft Windows user's computer desktop, or are hosted on a web page. According to Microsoft, it will be possible for the different types of gadgets to run on different environments without modification, but this is currently not the case.
Web gadgets run on Web sites such as Live.com and Windows Live Spaces
Live.com lets users add RSS feeds in order to view news at a glance. Building off Microsoft's start.com experimental page, Live.com can be customized with Web Gadgets, mini-applications that can serve almost any purpose (e.g. mail readers, weather reports, slide shows, search, games, etc.). Some gadgets integrate with other Windows Live services, including Mail, Search, and Favorites.
Users can create multiple site tabs and customize each with different feeds, gadgets, layouts, and color schemes.
Desktop gadgets are desktop widgets; small specialized applications that are generally designed to do simple tasks, such as clocks, calendars, RSS notifiers or search tools. They can also be used to control external applications such as Windows Media Center.
A panel, or sidebar, is found on either the right side (default) or the left side of the Windows desktop in the Windows Vista operating system. Gadgets can be placed on this sidebar, and they are automatically aligned on it. Gadgets can also be placed elsewhere on the screen, which generally causes them to expand and display more information. In Windows 7, the sidebar is removed, although gadgets can somewhat similarly be aligned on any side of the screen. Gadgets are toggled between the two sizes via a button in Windows 7.
Windows SideShow is a new technology that lets Windows Vista drive small auxiliary displays of various form factors, offering bite-size pieces of information. These include displays embedded on the outside of a laptop lid or on a detachable device, enabling access to information and media even when the main system is in a standby mode. Data can also be displayed on cell phones and other network-connected devices via Bluetooth and other connectivity options.