etc/passwd

Hi!!,
when I open the /etc/passwd file on my workstation, I find a entry as below...

+::0:0:::

Could u tell me what does it mean?? I have never seen anything like that before....

:confused:

It means to put the nis passwd map at that point.

thanx a lot.. But I donno what exactly is a NIS passwd map. All I can presume is that its perhaps some sort of method by which passwords of users in the other machines in the network can be mapped to this particular machine so that they can even log into this machine like a normal user.Am I right?? Could u please enlighten me about it??:confused: