%  library(win_menu) compiled into win_menu 0.00 sec, 33 clauses
Welcome to SWI-Prolog (Multi-threaded, 64 bits, Version 6.4.0)
Copyright (c) 1990-2013 University of Amsterdam, VU Amsterdam
SWI-Prolog comes with ABSOLUTELY NO WARRANTY. This is free software,
and you are welcome to redistribute it under certain conditions.
Please visit http://www.swi-prolog.org for details.

For help, use ?- help(Topic). or ?- apropos(Word).

1 ?- consult('~/Documents/CSC366/Assignments/proglang.pro')
|    .
% c:/Users/joshu/Documents/CSC366/Assignments/proglang.pro compiled 0.00 sec, 10 clauses
true.

2 ?- listing.

history(smalltalk, inventor('Alan Kay'), date(1980)).
history(lisp, inventor('John McCarthy'), date(1959)).
history(prolog, inventor('Alan Colmeraur'), date(1971)).

essence(smalltalk, objects, 'message passing').
essence(lisp, lists, 'recursive fuctions').
essence(prolog, relations, 'logical referencing').

language(smalltalk).
language(lisp).
language(prolog).

:- thread_local thread_message_hook/3.
:- dynamic thread_message_hook/3.
:- volatile thread_message_hook/3.

true.

3 ?-