The servers file must reside in /nsr/res.
It contains a list of all NW servers which are allowed to remotely execute a 
process on the client (via RPC).
The name format (short or FQDN) usually does not matter because DNS should be 
able to resolve them to the same IP.
This is a restrictive list - so if the list is empty of it does not exist, 
there are no restrictions.

However, instead of using the servers file, you could also use the command line 
to restrict the servers list by running "nsrexecd -s server1 -s server2 ...".
This is usually what you see in the UNIX/Linux startup scripts. Of course these 
commands have a higher priority.

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