Click.

Selects a part or geometry within a part.

Click and drag from right to left.

Selects all the parts or geometries that are partially contained by the bounding box.

Right-click and drag.

Flies.

Drag down to fly out, and drag up to fly in.

Middle-click and drag.

Rotates the structure.

Middle-click and drag. Release the mouse button, and then stop dragging.

The structure continues to rotate.

Click in the graphics area to stop the rotation.

Press SHIFT+middle-click and drag.

Pans.

Press CTRL+middle-click and drag.

Zooms in or out.

Drag down to zoom out, and drag up to zoom in.