Nmblookup? What's it all about, and should I let it allow connections?

I think I'm posting this in the right area... if not, apologies!
Every so often, Leopards firewall wants to know if I want to let 'nmblookup' to allow incoming netowrk connections. I don't beleive this to be anything mysterious or bad - an internet search suggests this is part of the 'Samba suite', whatever that is...
For the moment, I've been clicking Deny, but in the future, what should I do?
Cheers in advance for thoughts and ideas.

This should explain it a bit. I have mine set to allow always.
http://developer.apple.com/documentation/Darwin/Reference/ManPages/man1/nmblooku p.1.html

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Nmblookup? What's it all about, and should I let it allow connections?

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