ns1 & ns2 load balancing

[Jim]

Hey folks,
This covers a bit of DNS theory...

I've read that a secondary name server will load balance with its master - 
but I've never heard an explanation of how. Yes, the secondary is there for 
a backup should the primary fail, but what does the secondary name server do 
other than accept zone transfers from its master and where does this load 
balancing happen?
I've read that a client/server will run through its /etc/resolve.conf file, 
find the first nameserver entry (most likely the primary of the network) and 
only after a timeout will it request an answer from another nameserver 
entry. Just as in Windows, nslookup always defaults to querying the primary 
name server for requests. So when does the secondary get used? Or does it 
lay dormant until the primary goes down?

Any help would be appreciated :)