Get the service name using form 6i

Dear Oracle Gurus
Can anyone please tell me how can I get the connection service name using forms 6i.
Fawad

Let me explain in a bit detail.
Lets suppose, using TNSNAMES.ORA, I created a service by the name DBServer
similarly I have some other services in TNSNAMES.ORA and I may swith between these services
Now I connect my forms using scott/tiger@dbserver
I wish to get this service name i.e. 'dbserver' using the form 6i

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