While a mouse is very useful for people without fully developed keyboard skills, obligatory use of the mouse can be irksome for good typists and infuriating for touch typists. We have gone to great trouble to make SPM keyboard-driven for those who wish to do so.

To make things happen on a Windows screen you "press buttons" either by clicking on them with the mouse or pressing the key or key combination for that button. So – "pressing a key" means physically pressing a keyboard key; "pressing a button" means activating an on-screen button via mouse or keyboard.

For anyone not familiar with mouse function, "click on" or "press (an on-screen button)" means: move the mouse so as to position its on-screen pointer over the appropriate button and press the left mouse button once. (You can also encounter "double click on" and "right click on" instructions whose meanings should now be obvious.)