type: system variable location: built-in source file: xlglob.c (not implemented) Common LISP compatible: similar supported on: all machines
*APPLYHOOK* is a system variable that exists and is initialized to NIL. It is a hook that is intended to contain a user function that is to be called whenever a function is applied to a list of arguments. It is not, however, implemented in XLISP 2.0 - it only exists as a dummy hook.
*applyhook* ; returns NIL
COMMON LISP COMPATIBILITY: *APPLYHOOK* is defined in Common LISP and is often used to implement function stepping functionality in a debugger.