
A remote data source is uniquely identified by its DSN, the dsn argument
to this function. The connstr argument is presently ignored. The user and
password are the login name and password to use when communicating with
the remote data source. All Virtuoso users dealing with the remote data
source will appear as this user to the remote data source. Virtuoso will
make as many connections as there are concurrent users of the data source.
Connections are cached by Virtuoso.

The default qualifier of the user of the remote data source is usually
not relevant.  This function connects to the DSN in order to retrieve various meta data, which it stores locally.  The DSN should be defined in the server@s environment and the DSN@s database should be on line.
