Also Pixie Scheme ( http://web.mac.com/Jay_Reynolds_Freeman/My/Pixie_Scheme_III.html http://web.mac.com/Jay_Reynolds_Freeman/My/Pixie_Scheme_III.... ) - which h

Also Pixie Scheme ( http://web.mac.com/Jay_Reynolds_Freeman/My/Pixie_Scheme_III.html http://web.mac.com/Jay_Reynolds_Freeman/My/Pixie_Scheme_III.... ) - which has the notion of a persistent "world", but does not allow code to be loaded from external files.