Actually you must determine purpouse of to set netbios name (which service or app or other system tests etc... )
then set needed files in your system..

* if you want for samba servicess
u edit

Code:

/etc/samba/smb.conf
netbios name = my_scoserver

netbios names 15 chars and if your tcp/ip system host name more than 15 chars then netbios names will be only 15 chars portion of your system name..

and you can edit if there is

Code:

/etc/lmhosts 
127.0.0.1      localhost
10.10.1.10     mysecond_scoserver

* if you want change netbios system name

Code:

/etc/default/nbconf 
NB_HOST=my_scoserver

regards
ygemici