giacomo boffi <giacomo.boffi(a)polimi.it&gt; writes: Uhm ... I always wanted to bring this up and now seems to be the right time: namely `Z F' (`calc-user-define-formula') command stores the formula at the top of the stack as the definition for a key. This command prompts for five things: The key, the command name, the function name, the argument list, and the behavior of the command when given non-numeric arguments. And the first one fails because: "User-defined keys are not supported in Lucid Emacs" can this one look into this issue, too? bye, Adam.