Display the host and database name of the default database on the status report, toolbar (Drupal 7) and/or on the admin_menu bar if enabled (either Drupal 6 or 7) and/or in a block (to use with the admin module).
Reduced Forms uses the "#states" property of the Drupal Forms API to make all but on of the fields in a form invisible until a user enters something in the visible field.