your unique users will end up using the same SID. Even if you are successful at accessing the profiles in AFS using this solution, on the local machine file system the users are going to be sharing security credentials. It will be very easy for a user to obtain access to the previous user's profile data simply by disconnecting the ethernet cable at login time. There are many other problems with this model if there is any communication between Windows machines when using the account. There are also methods by which the user can place booby traps for subsequent users.
Sharing local windows accounts is a bad idea. Please do not do it unless you fully understand the risks involved. Jeffrey Altman
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