Alphanumeric Unique Key?

[geo_rich]

We are looking to pass out blank copies of a database to a number of clients for completion. On return these will be imported into a master copy. How do we identify returns from each body within the table structure? Is there an easy way to create an alphanumeric unique key in the main table?

 

[Joe4]

You can create any sort of unique key you want. How about basing one on something specific to that company, i.e. Company Name or Phone Number, etc?