It is possible to have several user profiles in Win9x. This gives the possibility for each user to have their own personal settings for Desktop, Start Menu, Favorites, My Documents, etc. By standard there is only a single user profile, which is automatically logged in.

If having Network Neighborhood installed then it might request for login, but it can be disabled:

• Open Control Panel and double click the Network-applet
• Select the Configuration-tab
• change the dropdown Primary Network Logon from Client for Microsoft Network to Windows Logon

If having several user accounts and want one to be automatically logged in (This can also be done with the PowerToy TweakUI):

[HKEY_LOCAL_MACHINE \Software \Microsoft \Windows \CurrentVersion \Winlogon]
AutoAdminLogon = "1"
DefaultUsername = "username"
DefaultPassword = "password"

Note requires that username of the previous user is NOT cleared.

More info MS KB152104