samba - Nov 2005 - master browser problems for one workgroup

Could somebody please tell me how can I know what computers of one local 
network are setuped up as master browsers for a local workgroup?  I mean, 
is it possible to use nmblookup or other command for this? what parameters 
are needed?

I'm having problems with a workgroup for which smbclient -L server gives 
different results every certain time, e.g. from one week to another the 
results change, like this:

         Workgroup            Master
         ---------            -------
         MYGROUP              PC1

and some weeks later:

         Workgroup            Master
         ---------            -------
         MYGROUP              PC2

(not only two, I have seen four different master browsers) perhaps the PCs 
of that workgroup are misconfigured, but I don't have physical access to 
them.  I'm thinking to install a master browser with an 'os level'
high
enough in order to get rid of the other possible master browsers.  Is it 
ok?

thanks,

Pablo Chamorro C.

-- 
Tel: +57 (2) 7314752/3222/2595 - Fax: +57 (2) 7310514
Carrera 31 #18-07 Parque Infantil - PO Box 1795 - Pasto