> 1: Is it possible on GAE? (if not, no problem I can host)

I would not know how to maintain state since you cannot cache in ram.
You an serialize the state but not functions and classes definitions.

> 2: Is it safe? how to make it safe?

Yes except that you have total access to datastore.

> 3: Can we have multi access?

This is not a problem if you can figure out 1.

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