Trying to avoid people entering duplicate records in the form, how do i

Trying to avoid people entering duplicate records in the form, how do i do this?

Klarprospects,

You may want to check this guides on unique submissions and Form ID.

 http://www.jotform.com/help/64-What-does-Unique-Submission-Mean

http://www.jotform.com/help/79-Add-Custom-Unique-IDs-to-your-Form-Submissions

Please check if this is what you need.