This is what I need: (BTW - Every site I have uses a self-hosted Wordpress install. So whatever scripts I use must be compliant with Wordpress. Before my client first gains access to our private on-line seminar room she needs to fill out a registration form. The system will then generate a 4-digit password and email it out. When she finishes her session in the seminar room (about a full day) I don't want her, or anyone else for that matter, to be able to use that password to get into the on-line seminar work area ever again. (That's because they only have one shot at completing the e-seminar correctly. No coming back in later.) In other words I need the ability to de-activate that password manually. How can this be done? Thanks a heap for all your help. You guys are amazing!