The Management Portal is a Web based system administration and management tool for Caché. You can use it to view your multivalue data as relational tables. You can also execute SQL queries against these tables.
Here is the home page for the Management Portal. Note the System Explorer menu on the left-hand side. This menu offers different views of your data: SQL (relational), classes, and globals.
To learn more about the Management Portal, read Using the Management Portal in the Caché System Administration Guide.