Version 1.9
Please key
The Please key is used to execute a command.
If you use an external keyboard, then you can use the Enter key.
You can toggle between activating or deactivating all the different functions (attributes) for the selected fixture(s). When you have a selection, press the Please key twice, notice in the Fixture view (sheet mode) that all functions background turn red. Pressing the Please key once will now toggle the activation. To learn more about what this mean, please read the What is The Programmer.
Advanced Functionality
If you press and hold the 
key plus the Please key then you open the command line view and gives the input focus to the command line. This is an easy way to begin typing commands from a keyboard.