Network Sharing and Security Model for Local Accounts

Beginning with Windows XP, Microsoft implemented some changes to the way access
control is applied to shared resources. In local or domain Security Policy, under the
setting entitled Network Access: Sharing And Security Model For Local Accounts, the
following two options are configurable: Classic Local users authenticate as themselves. Guest Only Local users always authenticate as Guest.
The Guest Only setting could be helpful for systems with lots of file shares to force
equivalent levels of access across all shares. We recommend sticking with Classic,
however, as we believe its better to be explicit about access control.