¥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.