"Keyboard keys" refers to the individual buttons or switches on a computer or typewriter keyboard that you press with your fingers to input letters, numbers, and other commands into a device. Full definition
From there open a command prompt window: press and hold Shift keyboard key while right clicking on any blank space. (android.gs)
From there open a new command prompt window: press and hold Shift keyboard key while right clicking on any blank space. (android.gs)
You never know if a player remembers which combination of keyboard keys does what, so she should be able to read the tutorials once again to refresh her memory. (thingtrunk.com)