samba - May 2006 - clearing old domain and wrokgroup cached names

Hi

I'm using samba  2.2.7a on linux, How can I clean old domain and 
workgroup names. Where is this old cached domain names reside. I only 
have one domain and two workgroups. if I create temporary workgroup I 
cannot clean it from my domain. any help would be grateful.

thanks
chami



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