Group Policy - Computer Configuration - Interactive Logon Message
Most companies have a technology usage policy which governs ways in which employees can utilize phones, workstations, servers, the network, etc. What many companies do not have, however, is a clear statement which users must accept (much like a software EULA) prior to logging onto the corporate network. Although employees are asked to sign a usage policy when they are hired (generally) instituting a longon usage statement can help aleviate the "they didn't tell me" defense in the case of a protested termination.
This can be done on a domain-wide level using Group Policy. Within the console tree, these settings are located: Computer Configuration\Windows Settings\Security Settings\Local Policies\Security Options\
Interactive logon: Message test for user attempting to log on - enable this setting and place your usage statement within the given box. (With Windows 2000 Server domains, this message is limited to 512 characters. In addition, Windows 2000 workstations will not properly display messages created on Windows 2003 Server or Windows XP machines using Group Policy. You must undefine the policy and then define it using a Windows 2000 box in order for it to be displayed properly on a Windows 2000 machine.)
Interactive logon: Message title for users attempting to log on - enable this setting and place the title for your usage statement with the given box.