Once i_prolog.pl is loaded, it stays loaded and the engine stays running until the application ends?

Yes, that's it. In this regard, Prolog is similar to Perl, once you load a module, the subs/predicates defined there remain defined until you shutdown the program.

In reply to Re^5: YASWI "Prolog System Error: Thread 1" by salva
in thread YASWI "Prolog System Error: Thread 1" by Steve_BZ

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