Specifying host string at connecting time

Hi everyone!!
I have 2 systems in my house. Both the systems have Oracle 9i installed in the Windows 2000 environment.
I am able to connect to the database without providing the Host String at the time of connecting on one system while on the other it raises a
ORA-12560: TNS:protocol adapter error
What do you think is the problem? Both the systems have the same Oracle services running.
Please help. I think this would clarify some of my problems regarding how Oracle services run.
Thak u all.

Define a registry key LOCAL with value "my_connect_string" in the registry subtree ORACLE_HOME of your SQL client

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