if you need to access both \\server and \\server3 which point to the same server, you won't be able. You will get an error message, saying there is a duplicate name on the network.
This is documented on a MS KB 231208: http://support.microsoft.com/kb/281308/en-us
You will need to set the DisableStrictNameChecking.
FYI, i tested it on a Windows 2003 cluster (file server) with success