Zoom 2D view – click and hold the right button on the mouse

Zoom 3D view – use mouse’s scroll, while holding cursor in 3D view

Panning image and surface – click and hold a scroll of the mouse

Rotate surface – click and hold the right button of the mouse

Change slice in 2D view – use mouse’s scroll, while holding cursor in 2D view

Change contrast  – click a sun icon on the side of the 2D view, click and hold the left button of a mouse to change the contrast

Undo last change – press Ctrl + Z

Redo last change – press Ctrl + Y

Import object to the project – press Ctrl + I

Export object out of the project – press Ctrl + E

Open project – press Ctrl + O

Quick save the project – press Ctrl + S