Anyone have a suggestion for this?

Hi, I need some advice or a suggestion on how I could solve this problem, it may just be a simple peice of code I haven`t thought of but any help is appreciated. I have created a form-database system, once a user has gone through the system the admin staff can then open up a file which will show them a template and then this is filled with info from the db via a Select statement which calls all documents with a Printed value of N, the administrator then prints the document, once printed they click a button at the bottom which updates the record and changes the value Printed to Y and then moves to the next record in the DB. This system worked great but now the people I have created this for have more than one administrator so if they both use the system the chances of them printing the same info is very high, anyone have an idea on how I can get around this as I am stumped. Thanks in advance Ade