You should define their access level and work on the password scheme accordingly. Password documentation is a great asset on large projects with multiple users. Superior password documentation can help you with this. I have found that password documentation along with a good macro utility can help make password changes a breeze with almost any level of complex database. The last things that you might want to log when you do this is the machine type the users are using, physical location, business manager and other business related activities.
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