I have connected to a remote computer using netbios null session. (net use \\IP\IPC$ "" /u:"" )

After that I've tried to map C$ of the remote computer which had been set as default share as my local drive.(net use * \\IP\C$ )

But when I tried to do this, it asked me the password even though the remote user didn't set any password. I think this is because there is a default password for this. If I am right, does anybody know the default password of windows2000 ?