Even though Windows 9x/Me may present you with a prompt to enter a username and password, you likely know that...
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this can be easily bypassed. If the machine belongs to a network with a Windows NT/2000 domain, you can force Windows 9x to require proper authentication with the network in order to logon. It's a simple registry tweak as follows:
Navigate to HKEY_LOCAL_MACHINE Network Logon
Right click on Logon and select "New"
Left click on "DWORD Value" and type "MustBeValidated" (without the quotation marks)
on the keyboard
Right Click on "MustBeValidated" and select "Modify"
Change "Value Data:" to 1 and select "OK" (0 would not require validation)
Reboot the computer
Windows 9x will now require proper authentication with the network in order to logon.