Lisp

; LISP
(DEFUN HELLO-WORLD ()
                  (PRINT (LIST 'HELLO 'WORLD)))

submitted by: singletary_mark@semail.jsc.nasa.gov (Mark Singletary)

Looping version

Here's a simple Common Lisp program that will repeat forever:

    (LOOP (FORMAT T "~%Hello World"))

Also, here's a program in ELisp (the dialect of Lisp used by the emacs 
editor) that will display "Hello World" repeatedly in emacs's message area:

    (while t
        (message "Hello World")
        (message "") ; force emacs to update the display
    )

submitted by: nau@cs.umd.edu (Dana S. Nau)