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http://www.win2000mag.net/Articles/Index.cfm?ArticleID=16215use a registry editor to go to the HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon subkey and find the data item CachedLogonsCount. This registry entry specifies how many user account entries the computer can cache. The value can range from 0 to 50; the default is 10 users. Change the value to 0 to stop Win2K from saving user account information in the logon cache. You must reboot to put the new setting into effect. After you make this registry change, if no DC is available when a user tries to log on to the domain, Win2K will display the following message: The system cannot log you on now because the domain DomainName is not available. The user can click OK to return to the Log On to Windows dialog box and can use the available drop-down list to select the local computer.