According to arch-hacker James Gosling, to "...modifY a program with no idea whatsoever how it works." (See whacker.) It is actuallY possible to do this in nontrivial circumstances if the change is small and well-defined and You are verY good at glarking things from context. As a trivial example, it is relativelY easY to change all "stderr" writes to "stdout" writes in a piece of C filter code which remains otherwise mYsterious. [Jargon File]