Marketing Bar Code System

I need a program that will run on a network enviroment were the GUI consists of a field that will be inputed data via a bar code reader. The data will be stored in a database for linking to other tables for verification of redemption. The coupon must be only inputed once, can't have duplicates and the input has to be flawless example (if you scan a coupon that is already in the system Access gives an error so you click ok but if you don't clear the field contents and you rescan the coupon it puts in as a new entry coupon 123 becomes 123123). ## Deliverables Complete and fully-functional working program(s) in executable form as well as complete source code of all work done. Complete copyrights to all work purchased. ## Platform Win 2000 Access 2000 and VB