Answer: arrowkey

AnswerCrossword Clue
ARROWKEYIt may be used to scroll
ARROWKEYIt may work when the mouse won't
ARROWKEYScrolling convenience
ARROWKEYWord-processor navigator
ARROWKEYCursor mover
ARROWKEYMover left or right
ARROWKEYPointer for a computer user