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To build applications, developers use the App Engine SDK, to which Google in version 1.3.6 has added the Namespaces API (Application Programming Interface). It allows developers to serve the same application to multiple customers, with each one seeing their own unique copy of the application, according to Google. Developers don't have to change their code to use the API, but "a little extra configuration" is needed, Google said
Other additions to the new version of the development kit include a system for distributing images, which is based on the same infrastructure Google uses for Picasa, and the ability for developers to customize error messages.
The SDK for Java or Python can be downloaded from Google's website. Developers should keep in mind that the App Engine SDK is under active development, Google cautions on the download site.
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