Using sqlplus without tnsnames

I was using vpn at home last night tried to remote into one of my databases: sys/pwd@sidname as sysba
My questions is I do not have a tnsnames file pointing to this service. How is it possible to connect to an oracle db without using a tnsnames.ora file?
thanks.

No. I have oracle 10g installed on my laptop at home. I started SQLPLUS from the command prompt (Windows). I did a search for tnsnames.ora on the entire computer and none of the files have the services I connected to. Is it possible to connect?

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