Web Robot site retrieval can be performed with the WS.WS.SERV_QUEUE_TOP PL function
integrated in to the Virtuoso server.
To run multiple walking robots all you simply need to do is kick them off from
separate ODBC/SQL connections and all robots will walk together without overlapping.

>From a VSP interface, after calling the retrieval function you may
call http_flush to keep running tasks
in the server and allowing the user agent to continue with other tasks.
