It is important to understand the position of a keyboard relative to other hardware on the desk. As the keyboard tends to be the primary input device in most office jobs its location is important to note.
Keyboard Position with Single Monitor
Alphabetical keys are straight in-line with monitor.
Keyboard Position with Dual Monitors
Alphabetical keys are in line between the monitors.
Keyboard Position with One Monitor
Switching the mouse side reduces the reach and risk of shoulder injury.