1 or key next to the P key

Adds the current page to the selection list.

2 or second key next to the P key

Removes the current page from the selection list.

scroll mouse wheel

Scrolls the page up or down if it doesn't fit on the screen.

CONTROL + mouse drag

Scrolls the page in the direction you are dragging the mouse.

SHIFT + mouse wheel

Opens the prior or next page in the PDF file.

CONTROL + mouse wheel

Zooms in or out of the page.

right mouse button + mouse wheel

Opens the prior or next item in the search results.