NO listener.ora and NO tnsnames.ora Needed
                     Hi All, 
i have tried to access the database without TNS entry and listner with the help of below technic.It is working  on 11g.
                sqlplus [user]/[password]@//[database_host]:[port]/[service_name].
but i am failing again and again in 10g. can anyone tell me wheather it is posible in Oracle 10g or not.
looking forward for valueable ideas.
Thanks:
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