any implementation of SWI-Prolog. Note, however, that clauses are stored as virtual machine instructions. Changes to the compiler will generally make old compiled files unusable.

Quick Load Files are created using qcompile/1. They are loaded using consult/1 or one of the other file-loading predicates described in section 4.3. If consult/1 is given an explicit .pl file, it will load the Prolog source. When given a .qlf file, it will load the file. When no extension is specified, it will load the .qlf file when present and the .pl file otherwise.