HMIsBalloon
returns TRUE = help is currently displayed
You can use the HMIsBalloon function to determine whether a help balloon is currently displayed on the screen.
currently displayed on the screen and FALSE if a help balloon is not
currently displayed. This function is useful for checking whether a
balloon is showing before you perform an action that redraws the
screen. For example, you might want to determine whether a balloon
is displayed so that you can remove it before opening or closing a
window.