Can I access Datastore entities of my other Google App Engine Applications?

No, this cannot be done. However, as Nick Johnson points out, you can use remote_api to do what you need.

Don't forget, you can have multiple versions of an application running against the same datastore. Only 1 version of the app is your "default" and gets your non appspot.com domain name, but you can have completely different codebases running against the same datastore/memcache addressable with ..appspot.com.

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