fork_prolog example

"Ferreira Maurizio" <[email protected]>
Newsgroups gmane.comp.gnu.prolog.general
Message-ID <[email protected]>
Any example about using fork_prolog ?
With this function, can I start a parallel thread ?
if so, how? 
and how can I start a thread on a given predicate ?
Regards.
Maurizio.
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