Here I changed the function names to reflect the code: ------------------------------------------------------------------------------- (defpackage :sessions (:use :cl :hunchentoot :cl-who :parenscript :ht-simple-ajax)) (in-package sessions) (setf *access-log-pathname* "c:/lisp/hunchentoot-log/access.log") (setf *message-log-pathname* "c:/lisp/hunchentoot-log/message.log") (setf *js-string-delimiter* #\") (defparameter *ajax-processor* (make-instance 'ajax-processor :server-uri "/ajax")) (push (create-ajax-dispatcher *ajax-processor*) *dispatch-table*) (defun-ajax show-x () (*ajax-processor*) (write-to-string (incf (session-value 'x)))) (define-easy-handler (main-page :uri "/") () (start-session) (setf (session-value 'x) 10) (with-html-output-to-string (*standard-output* nil :prologue t :indent t) (:html :xmlns "http://www.w3.org/1999/xhtml" (:head (princ (generate-prologue *ajax-processor*)) (:script :type "text/javascript" (str (ps (defun show-x () (alert (ajax_show_x)))))) (:body (:p (:a :href (ps-inline (show-x)) "Show X"))))))