Hya
A master is a master becaus in it's config file /usr/openv/netbackup/bp.conf the first entry is SERVER=
If I'm not in 1st position in bp.conf it means I'm a media server (or a console) working with another master.
You must stop and restart services for this to work.
Under Windows, the bp.conf does not exist, but the way it works is the same with the registry entry :
HKEY_LOCAL_MACHINE\SOFTWARE\VERITAS\NetBackup\CurrentVersion\Config
The enry SERVER lists the known media servers and console .. the first name IS the MASTER SERVER.
This has been wokring that way with all versions of NBU.
Binaries are exactly the same for media and master servers under UNIX. For Windows, I would still suggest to override the installation.
Kerk the noob