But... you *can* hurt the hardware! You can smoke older
monitors by feeding them video signals for which they weren't
designed. You could trash older disk drives with the wrong (or a
repeated) sequence of seek commands. You could break the chains on
old chain printers using resonance effects. You can, over time damage
your screeh by not using a good screensaver (or powering down the
screen between sessions).
Craig Milo Rogers