Microsoft Access User-Level Security Tutorial

The next screen asks you to enter your name and company. This step is optional. You'll also see a strange string called the WID. This is a unique identifier assigned randomly and generally should not be changed.

Also on this screen, you'll be asked whether you want your security settings to apply to only the database you're currently editing or whether you want the permissions to be default permissions that apply to all databases. Once you've done this, click Next.