Explain the following mouse actions:

$4\mathrm{.}2\mathrm{.}1$ Double clicking

$4\mathrm{.}2\mathrm{.}2$ Dragging

$4\mathrm{.}2\mathrm{.}3$ Pointing

$4\mathrm{.}2\mathrm{.}4$ Single clicking

$4\mathrm{.}2\mathrm{.}5$ Scroll wheel