To use your Raspberry Pi without a monitor using PiFace CAD, first download the commandCAD files from github by opening a Terminal and typing
git clone https://github.com/thomasmacpherson/commandCAD.git
Move into the newly created folder
Run commandCAD with the command
You will see the PiFace CAD's backlight come on and a
$ with a flashing cursor.
Type your command on your RaspberryPi's keyboard, if you make a mistake, use backspace to delete the typo.
Press the return (enter) key on the keyboard to run the command
You can cycle through the previous commands for your session by flicking the rocker switch to the left. After you have cycled through your current session's commands, it will begin to cycle through the commands in the previousCommands file. When you find a command you want to run, hit enter on the keyboard.
To save a command to the previousCommands file, type out the command (without hitting return) then press the third button from the left on the PiFace CAD
To edit the previousCommands file, open it in your favourite text editor.