Mouse
Zoom in and out the model: Move the middle wheel of the mouse up or down.
Pan left, right, up or down: Press the middle wheel and move the mouse to the left, right, up or down.
Rotate (orbit) 3D model: Press keyboard Shift, and at the same time press the middle wheel and move the mouse to the left, right, up or down.
Selection
Left-click: to select an item.
Left-click and drag mouse to draw a rectangular: to select a graphical region.
Alt key: to switch between graphical items nearby.
Ctrl + Left-click: to add another item to selection.
Shift + Left-click: to unselect an item.
Keyboard shortcuts
Esc to end a continuous series of actions.
(alternatively 
)
Ctrl-Z = undo an action.
(alternatively 
and 
)
ZR and use 
to select the region = Zoom in Region.
ZO = Zoom Out.
ZF = Zoom to Fit.
ZA = Zoom All to Fit.
The tool-tip help also shows the keyboard shortcuts for some of the menu items, e.g. WA for Wall:
Wheels and Viewcubes
2D wheel:
Full netvigation wheel:
Basic view object view:
Netvigation wheel menu to choose between different types of wheels:
Netvigation bar menu:
Zoom menu:
3D View cube:
