[opensuse] what does 127.0.1.1 mean?

12.1
Hi
We have a bind nameserver for our 192 domain.

For a non static IP client I have to set the line:
127.0.1.1 hostname.domain hostname
in /etc/hosts otherwise hostname -f and lots of other stuff doesn't work.

1. Why?
2. What should the file /etc/HOSTNAME contain?
a. fqdn
b. hostname

Thanks,
L x
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