Google 在 2007 年 5 月发布了 Gears，它是一种为生成离线网络应用软件而开发的开源技术，Google 希望能在广大开发者的帮助下测试完善功能和发现产品的局限性。简单地说，它是 Google 推出的开源的浏览器插件，而开发者围绕着这个插件进行开发。2008 年 3 月，Google 推出了移动版 Gears，应用进程开始蔓延。
Google的官方网站：http://code.google.com/intl/zh-CN/apis/gears/
一个不错的学习站点：（中文的）https://www6.software.ibm.com/developerworks/cn/education/web/wa-googlegears/index.html
文件缓存位置
Location of cached files
The LocalServer stores files that your application captures in a location determined by the browser and platform.
Windows Vista - Internet Explorer
Location: {FOLDERID_LocalAppDataLow}\Google\Google Gears for Internet Explorer
Example: C:\Users\Bob\AppData\LocalLow\Google\Google Gears for Internet Explorer
Windows Vista - Firefox - Files are stored in the user local profile directory.
Location: C:\Users\<username>\AppData\Local\Mozilla\Firefox\Profiles\{profile}.default\Google Gears for Firefox
Example: C:\Users\Bob\AppData\Local\Mozilla\Firefox\Profiles\uelib44s.default\Google Gears for Firefox
Windows Vista - Chrome - Files are stored in the user local profile directory.
Location: C:\Users\<username>\AppData\Local\Google\Chrome\User Data\Default\Plugin Data\Google Gears
Example: C:\Users\Bob\AppData\Local\Google\Chrome\User Data\Default\Plugin Data\Google Gears
Windows XP - Internet Explorer - Files are stored in the user local profile directory.
Location: C:\Documents and Settings\<username>\Local Settings\Application Data\Google\Google Gears for Internet Explorer
Example: C:\Documents and Settings\Bob\Local Settings\Application Data\Google\Google Gears for Internet Explorer
Windows XP - Firefox - Files are stored in the user local profile directory.
Location: C:\Documents and Settings\<username>\Local Settings\Application Data\Mozilla\Firefox\Profiles\{profile}\Google Gears for Firefox
Example: C:\Documents and Settings\Bob\Local Settings\Application Data\Mozilla\Firefox\Profiles\uelib44s.default\Google Gears for Firefox
Windows XP - Chrome - Files are stored in the user local profile directory.
Location: C:\Documents and Settings\<username>\Local Settings\Application Data\Google\Chrome\User Data\Default\Plugin Data\Google Gears
Example: C:\Documents and Settings\Bob\Local Settings\Application Data\Google\Chrome\User Data\Default\Plugin Data\Google Gears
Mac OS X - Safari - Files are stored in the user Application Support directory.
Location: ~/Library/Application Support/Google/Google Gears for Safari
Example: /Users/Bob/Library/Application Support/Google/Google Gears for Safari
Mac OS X - Firefox - Files are stored in the user local profile directory.
Location: Users/<username>/Library/Caches/Firefox/Profiles/{profile}.default/Google Gears for Firefox
Example: Users/Bob/Library/Caches/Firefox/Profiles/08ywpi3q.default/Google Gears for Firefox
Linux - Firefox - Files are stored in the user home directory.
Location: ~bob/.mozilla/firefox/<firefox's profile id>/Google Gears for Firefox
Example: ~bob/.mozilla/firefox/08ywpi3q.default/Google Gears for Firefox