F4.5.3} Middle Mouse button

 A more handy way of navigating is with the use of the middle mouse
 button (or the right one in case of two, by activating the
 appropriate preference see below)

 Pressing the middle mouse button, alone or with the following keys

 Keys                Description
 -----               -----------------------------------------------
 alone               Pan/Move viewport

 + Right mouse       Orbit viewport

 + Ctrl              orbit projection using a virtual trackball

 + Ctrl-Middle-Shift orbit projection using a virtual trackball with
                     steps of 5 degrees

 + Shift             select rectangle region and zoom into

 + Shift-Middle-Ctrl select rectangle region and zoom out

 With the mouse wheel alone you can zoom in/out.
 Ctrl + Wheel        pan/move forward or backward
 Ctrl+Shift+Wheel    smoother pan/move forward/backward

 Shift + Wheel       resize-cursor: when a body is selected
                     the drag cursor dimensions can be changed
                     with Shift + Wheel


 Right mouse button
 ******************
 If laptop mode is enabled, then it behaves like the middle button

 Keys                Description
 -----               -----------------------------------------------
 alone               Opens a popup context menu

 + Ctrl              Opens the insert popup menu

 Notes:
 1. Middle and Right button can be swapped by activating the
    laptop mode in the Preferences/Geometry
 2. Wheel sense of zooming can be modified in the
    Preferences/Geometry
 3. You are required to restart the Geometry Editor after changing
    the mouse preferences
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