(from http://www.wikipedia.it)
Google Gears is a beta offered by Google can provide access off-line to some services that usually operate on-line.
It installs a database engine based on SQLite , on the client system to store data locally. The pages that Google Gears enabled by using data from the local cache instead of on-line.
Using Google Gears, a web application may periodically synchronize the data in the local cache with the online service. If there is a network connection, the synchronization is deferred until the connection will fail again. Thus Google Gears enables web applications to work even when access to network services is absent.
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