help-window-display-message
help-window-display-message is a compiled Lisp function in `help.el
'.
(help-window-display-message QUIT-PART WINDOW &optional SCROLL)
Display message telling how to quit and scroll help window.
QUIT-PART is a string telling how to quit the help window WINDOW.
Optional argument SCROLL non-nil means tell how to scroll WINDOW.
SCROLL equal `other' means tell how to scroll the "other"
window.