Players can hide or display their dataorbs under Advanced Options.
The Hitpoints Dataorb shows you how many Hitpoints you have left. If you are poisoned or envenomed, you can simply click the Hitpoints dataorb to cure it, provided you have any sort of anti-poison or anti-venom in your inventory.
The Prayer Dataorb shows you how many prayer points you have left. You can also use it as a Quick-prayer. To select a quick-prayer, right-click on the Prayer dataorb and click Setup Quick-prayer. If you click on the dataorb, the quick-prayer you selected will activate.
The Energy Dataorb tells you how much energy you have left. Energy is used for running. If you click on the energy dataorb, you activate running. If you are already running, you can click the Dataorb to disable it.