When the cursor is hovering over a launcher, a pin icon will appear in the top right-hand corner.

Certain medieval theologians — who puzzled over how many angels could dance on the head of a pin — would have had a field day with this picture by retired entomologist Klaus Bolte of Canada.

Of course, to thwart the scheme you could simply place your hand over the entire keypad to impart heat to every key after you punch in your PIN.