I assume you are referring to windows network browsing.
Typically this works best using domain controllers etc, but if you have none, broadcasting is generally used to find the 'master browser' ....although Microsoft would be the best experts on this advice.
Broadcasts will not pass across different networks.....so a broadcast on one lan segment wont reach a DMZ segment....or a pptp segment.
We usually only see this issue with pptpo connections and KB article KB62391has some tips.
Hope this helps.
Hi! You got me in the right direction Ross. That is what I was looking for. I found a utility and instructions here http://www.ifrankie.com/?p=45 which led me to this site. This person has the exact same problem. http://www.sevenforums.com/network-sharing/201222-how-determine-master-browser-w indows-7-a.html
The NAS 'won' an election, and didn't know what to do after that. WTF Microsoft!! I didn't believe it when the name of my NAS came up with browstat.