Configuring AUTOLOGON allows a station to completely reboot after a remote reboot request.  Without this, rebooting a SCADA node will require a local operator to enter a password or, even if a password is not configured, to press the enter key.

AUTOLOGON also forces the station to be logged on with a user name that is recognized by the any shared network drive for archive data with Log Data Maintenance.

To allow Automatic Logon for a computer, a summary of the steps are:

1.        In the Registry Editor, select this subkey:

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft
           \Windows NT\CurrentVersion\WinLogon

2.        Add a value entry named AutoAdminLogon of type REG_SZ and specify a value of 1

3.        Add a value Entry named DefaultPassword of type REG_SZ and enter the password of the user listed under the value DefaultUsername. This should be the user name that the node will reboot using and should be a recognized username by the computer. It should be the USERNAME configured and used to map a network drive in the previous section.

Note- a Password must be configured for Autologon to work more than once. If a blank password is configured for the user, then Autologon will work once, then reset the AutoAdminLogon value to 0, thereby disabling further autologons until reset by the Registry editor.

WARNING: Using Registry Editor incorrectly can cause serious, system-wide problems that may require you to reinstall Windows NT.  Microsoft cannot guarantee that problems resulting from the incorrect use of the Registry Editor can be solved.  Use the Registry Editor very carefully.