Evaluate Next Input selects and then evaluates the next cell in the notebook.
This command moves to and then evaluates the next input cell below the current selection. When the current selection is a single input cell, it is evaluated; otherwise, the next input cell after the current selection is selected. By repeatedly choosing this command, you can evaluate all the input cells in a notebook, one at a time.
You need to choose this command twice for each cell, once to select it and once to evaluate it. This allows you to see the next input before evaluating it, and is good for pre-programmed demonstrations.