Questions regarding delay in a scene.

I have a pretty basic question, but have not been able to find answers on the forum.

When I add a delay on a scene you will get some arrows on the devices that are part of the scene.
What do these arrows mean, and what function do they have?

Return to previous setting. E.g. A light is off and then triggered to go to 50% you then add a delay and click the reverse arrow would then switch the light off after the delay has been reached.

I was hoping it had that function.
Thanks for your answer.

Here s a previous link that referred to creation of a scene and its basic functions.
http://forum.micasaverde.com/index.php?action=dlattach;topic=10969.0;attach=6116

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