Before you can run the DataServer modules in the Windows client, you must set environment variables., and verify access to Oracle files.
To configure the local DataServer in a Windows client:
1. Make sure the Oracle_HOME and Oracle_SID variables are set correctly. You can set variables in the registry (Oracle sets Oracle_SID at installation time), at the system level or in a .ini file. See the following table for information on these variables.
2. If you plan to use Oracle Networking to access the Oracle database, make sure that the client executable has read access to the tnsnames.ora file in the directory indicated by the TNS_ADMIN variable in the oracle.ini file. Settings for your instance in the tnsnames.ora file will override values for Oracle_HOME and Oracle_SID.