You can use your page even without an Internet connection!
If you open your page and then disconnect from the Internet, you can still consult your page, open and close folders. (If you have protected folders on your page, open at least one of them before disconnecting.) Should you want to create or edit items, you would have to re-connect to the Internet.
You can save your page to a file and use it when there is no Internet connection available.
You can also print out the whole page, or any selected items or folders, to use your page even when you are away from any computers!
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