Creator API: last records first?

Creator API: last records first?

Hi guys! I'm working with a Creator database in Flash. I'm trying to get my records 20 at a time, last ones first. Any way to do that? By default I get the first ones first. I could use range, but I can't find a way to see how many records there are. If I knew that, I could go

range last-20 to last
range last-40 to last-20

(I tried making a view that sorts them, but I can't load the view using REST for some reason, keep getting a 404 on the URL. Maybe because the application is private?)

Thanks for helping me out! Great app btw.

Sander.