(newbie) hostname, workgroup

[Marvin Vek]

debian installed nice, i can resolve it's ip in the network too, just not it's 
hostname niobe.

/etc/resolv.conf
nameserver 62.216.31.50

/etc/hosts
127.0.0.1       localhost
192.168.1.2     niobe

and where and how can i set the workgroup it has to be in?èPÔ” ‘ 
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