Formativ is designed to execute one applet at a time. This means any currently executing applet must complete before another can be initiated. While Formativ allows you to chain applet execution, this feature still complies with the one applet at a time restriction.
Being independent from the GroupWise Client process in which Formativ runs, the Notify program process will open/send messages regardless of any applet currently being executed.
One work-around may be for the applet to close Notify when it starts and re-open it at the end of the process. This may not be practical and not sure of the overhead involved.