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Version 1.9 offers better portability including an MS-Windows 3.1
version. Changes to the Prolog system include:
Redefinition of system predicates
Redefinition of system predicates was allowed silently in older versions.
Version 1.9 only allows it if the new definition is headed by a
:- redefine_system_predicate/1 directive.
`Answer' reuse
The toplevel maintains a table of bindings returned by toplevel goals and
allows for reuse of these bindings by prefixing the variables with the $
sign. See section .
Better sourcecode administration
Allows for proper updating of multifile predicates and finding the
sources of individual clauses.
Passani Luca
Tue Nov 14 08:58:33 MET 1995