Storing the Cursor for App Engine Pagination

[aaron]

I'm trying to implement pagination using App Engine's RPC and GWT (it's an app engine connected project).

How can I pass both the query results and the web-safe cursor object to the GWT client from the RPC?

I've seen examples using a servlet but I want to know how to do it without a servelt.

I've considered caching the cursor on the server using memcache but I'm not sure if that's appropriate or what should be used as the key (session identifier I would assume, but I'm not sure how those are handled on App Engine).

Links to example projects would be fantastic, I've been unable to find any.