"Next" and "Previous" can be used to quickly select individual fixtures in order. This is useful for stepping through each fixture and tweaking their parameters in turn. The Next function can be accessed by holding Shift and tapping the right arrow key, and Previous can be accessed by holding Shift and tapping the left arrow key.
Next and Previous are written in the command line, bringing the added benefit of allowing you to backspace through the commands:
1, Next, Next, Previous,
Next and Previous can also be used to select individual cells of multicell fixtures.