troubleshooting Question

Connecting to database using Pl/Sql Developer ver. 7.1.5.1398

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gram77Flag for India asked on
Oracle Database
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I am trying to connect to the database using pl/sql developer.

I have the following queries:
1. Like in Sql Developer and TOAD, i do not see a way in which i can connect to the database directly without using TNSNAMES.ORA. In Sql Developer and TOAD, I directly provide the connection settings like Hostname, Port, Service Name, Username etc. Is there any way I can provide connection details directly in Pl/Sql developer

2. I have multiple homes configured.
C:\oracle\ora10
C:\oracle\product\10.2.0\client_1\NETWORK\ADMIN: TNSNAMES.ORA file present
C:\oracle\product\11.2.0\client_32\NETWORK\ADMIN: TNSNAMES.ORA file present

Against which in Pl/Sql Developer I see Oracle Homes as
Ora920
ORACLE10GODBC
OraClient10g_home1
Client11gR2_32bit

Inspite of having the correct TNSNAMES.ORA file in the above Oracle Homes, I do not see correct entries in Database connection string. Why?
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