to stop participating on browser elections you need to edit the registry, using regedit.exe

Only know the key for NT (but should be similar wor w9x):

   HKLM\System\CurrentControlset\Services\Browsers\Parameters

  IsDomainMaster false

  MaintainServerList no

keep in mind that these values should be true/yes on your PDC.

> what is the master browser?

the machine holding the list of all computers connected to the workgroup/domain. There are

  exactly one master browser

  multiple backup browsers

  multiple potential browsers