O'reilly samba book vs. BROWSING.txt

[Giulio Orsero]

BROWSING.txt says:
- you have 3 subnets
- you need a wins server
- in 1 subnet you need a domain master browser (samba or nt)
- in the other 2 subnets you need a local master browser, which could be
a Win9x machine.

O'reilly "Using Samba" says (chapter 5, available online):
1) You must have either a Windows NT or Samba machine acting as a local
master browser on each subnet in the workgroup/domain. (If you have a
domain master browser in a subnet, a local master browser is not
needed.) 
2) You must have a Windows NT Server or a Samba machine acting as a
domain master browser somewhere in the workgroup. 
3) Each local master browser must be instructed to synchronize with the
domain master browser. 
Then talks about remote announce.
 
QUESTIONS:
1) Given an nt/samba domain master browser, the other simple local
master browsers can be win9x machines as BROWSING.txt says, or need to
be samba/nt as the book says?
2) Is it true that just 1 domain master browser and 1 wins server (+
local mb) are needed for multiple subnet/1 workgroup? BROWSING.txt and
the book seem to agree on this but:
- the book then talks about "remote announce", is this required (reading
BROWSING.txt it seems this is not needed)? 
- I read posts on the smb newsgroup where people needed to set up samba
as domain master browser in all the subnets to get the complete browse
list everywhere.

Thanks.

-- 
giulioo at tiscalinet.it