The VLEE project is worth a look: VLEE, Virtual Lisp Engine Emulator, run emulation of best Lisp Machine, into linux cluster system like CADR, E3, Ivory, XL1200, 36xx and more http://vlee.sourceforge.net http://sourceforge.net/projects/vlee Paolo -- EncyCMUCLopedia * Extensive collection of CMU Common Lisp documentation http://www.paoloamoroso.it/ency/README