I would like to have a section in the web page the initially displays "Login with Google" button. When user clicks it and authenticates the section should display read-only spreadsheet from the user's own Google Drive that was previously created elsewhere. The name and location of the doc would be the same for any user. If user has no doc at that location (say Drive/foo) the simple error message is displayed.
I would prefer not to have iframe and have no problem coding in JavaScript. In fact I prefer to code the whole thing in JavaScript
P.S. If this is not currently possible it would be nice to get it confirmed by someone in the Google Drive SDK team