Clear the username of the previous logged on user, so it is not displayed to the next user (Will disable Automatic Login):

[HKEY_LOCAL_MACHINE \Network \Logon]
DontShowLastUser = "1"

More Info MS KB135586

Prevent caching of passwords in pwl files (Will also forget dialup passwords):

[HKEY_LOCAL_MACHINE \Software \Microsoft \Windows \CurrentVersion \Policies \Network]
DisablePwdCaching = 1

More Info MS KB137826
More Info MS KB141858
More Info MS KB148925

Prevent logon unless authenticated by the domain: (This can also be configured with Poledit -> Default computer -> Windows 95 network -> logon -> "Require validation by network for windows access")

[HKEY_LOCAL_MACHINE \Network \Logon]
MustBeValidated = 1