¥Translating the surface:
HMouse button-2: keep it down while moving the mouse to
translate surface along screen X and Y axes
or any combinations of the two.
HAlso try shift+arrow keys.
¥Zooming in/out:
HBoth buttons 1&2 or Shift + button 2: while pressing
buttons, move mouse down or up to zoom in
and out, respectively.
HAlso try keyboard buttons 'Z' and 'z' for zooming in and out, respectively.