DSN (Data Source Name) is an ODBC connection identifier for Windows applications. Here is how you can define a DSN on your Windows system:

► Go to Control Panel.

► Go to Administrative Tools.

► Run Data Sources (ODBC).

► Go to System DSN tab.

► Click the Add button.

► Select the "Oracle in XE" driver.

► Enter Data Source Name: ggl_DSN.

► Enter Description: globalguideline DSN Oracle Setting.

► Enter TNS Service Name: XE.

► Click the Test Connection button.

► Enter User Name: ggl.

► Enter Password: retneclgg.

► Click the OK button.

You should see a "Connection successful" as shown in the following picture:

DSN Setting for Oracle ODBC Driver