My boss wants a Netflix-like queue feature on a continuous form. I was thinking of having the continuous form look like:

Rank Audit_ID Question
___ 5 Blah

___ 5 Hi

___ 5 Derp

The user would just type a number in the "Rank" column and the continuous form will re-query and sort by Rank Ascending. My only question is, how do I code it so that you can't type in the same number twice and is there any better way to do this?