>I put the STOP statement at the end of the program.
>When it gets to the end, it doesn't stop at all, I don't have time to see
>what the output was.

As far as the system is concerned, it _is_ stopping - as soon as the 
program "stops", it is no longer in memory or on screen. What you want is 
something more like "pause". Do something like this instead:

DO:UNTIL FN BUTTON
STOP

This way, the program waits until the user has clicked the mouse before 
ending - giving you a chance to see what the output was.

-Mars