miwbrown, have you taken a look at the knowledge-base article related to credentials and where to use what within PocketCloud?
If that is what you are referring to, please let me know exactly what you are experiencing so I can better troubleshoot the issue with you.
Visit our Knowledge Base and Manuals web site at pocketcloudsupport.wyse.com
Can you please telle us if you review the recommended documentation and if you are being asked for a password only or for a username/password? What version of Windows are you using (e.g. Windows 7 home premium, Windows XP Pro, etc.)?
Visit our Dell Wyse Thin Client Knowledge Base and Manuals web site at www.wyse.com/KB
Visit our Dell Wyse PocketCloud Knowledge Base and Manuals web site at http://pocketcloudsupport.wyse.com/forums