Unfortunately, Lisp Machine software was not particularly secure. Everything ran in the same address space, with no protection; ordinary user code could, for i

Unfortunately, Lisp Machine software was not particularly secure. Everything ran in the same address space, with no protection; ordinary user code could, for instance, just call a low-level disk driver. And the code running in this environment was written in pre-Morris-worm days, when no one had ever heard of a remote code execution vulnerability. (I remember some people needed to be convinced that running an "eval server" --- a server that would execute code that came over the network from unauthenticated sources --- was a REALLY BAD IDEA. In this environment!)