php & netbios

i've googled like crazy, and couldn't find an answer. makes me think it's not possible, but i thought i'd ask here.

is it possible, using php, to resovle an IP address to a netbios name? this is for my department's intranet. i'm looking for a way to authenicate users without having them login. that's all we need, is yet another userid/password to remember.

i think i could hack something together using either nbtstat or nmblookup, but it would most likely be very inefficient and ugly.

anyone have any other ideas?

thanks...

addition: btw, the php pages will be on a linux box.