Domain check and registration tutorial
Making and checking a Domain via Provider APIs Exposing new domains

## Example

- The SQL script makes a Virtuoso API functions to create and check domains.
- The interface page has a test buttons which sends a REST request to the server.
- The Service for testing will just return its own argument.
- At least 2 web threads are needed, so this should be noted before starting. An Error message is shown if only one is available.
- The page shows the command and explains the manual operation for doing this from the admin interface.