Bernhard, bt> don't know for the latest (Vista), but checked for XP: debug is there (see attachment) Thanks. Debian provides all the tools I need outside of Oberon and Aos. In many instances the Debian software is better. objdump for example can disassemble code for most, if not all, Intel architectures and for other machines as well. Also, Debian, Oberon and Aos don't impose severe hardware requirements as these commercial systems do. Regards, ... Peter E. -- http://carnot.yi.org/