You can use the Windows parameters listed here with Oracle Net Services.

Oracle Net Service first checks for the parameters as environment variables, and uses the values defined. If environment variables are not defined, then Oracle Net Services searches for these parameters in the registry.

• About LOCAL Parameter
  You can use the parameter LOCAL to connect to Oracle Database without specifying a connect identifier in the connect string.
• About TNS_ADMIN Parameter
  You can add the parameter TNS_ADMIN to change the directory path of Oracle Net Services configuration files from the default location of ORACLE_HOME\network\admin.
• About USE_SHARED_SOCKET Parameter
  You can set the parameter USE_SHARED_SOCKET to true to enable the use of shared sockets.