Google Spreadsheets Has an API

I told you Google Spreadsheets is way ahead of Google Docs. Now you can update your spreadsheets programmatically using Google Spreadsheets API. You can use it to get a list of spreadsheets for an account, to add or delete rows from a spreadsheets or to send simple SQL-like queries.

While the API isn't powerful enough to create desktop applications, as you can't manage spreadsheets, you could use the API to synchronize multiple spreadsheets or to import data from the web.

The API uses Google Data, "a simple standard protocol for reading and writing data on the web".

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