Google Docs Embed on PHP Site

I've been reading through Google Docs API and having some trouble. I want to do the following:

1. Embed a Google Doc in my web application

2. Anyone who can access that page in the web开发者_开发知识库 app can edit the Google Doc, without having to sign in to their Google account

3. (If Possible) Show who made which changes using their identities in my web app, not their Google account.

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1. There are a few ways you can embed. A quick Google search will yield several answers.

2. As far as I know, it's not possible to edit without signing into an account.

3. As this is related to (2), I don't think this is possible as all.