Sictus/Swi predicate query

Hi,

Just on the off chance someone may know. I have a prolog program written for Sictus by someone else not by me, and it almost runs on my Swi Prolog. However the Sictus program has a predicate kill/1 that I am not quite sure about, and do not know if there is an equivalent in Swi Prolog. I can make some guesses about what it does, but I am not certain. I want to run the program on Swi Prolog since I have no access to Sictus.

Thanks for assistance.
Regards
Goffredo