Autograph uses left/middle/right mouse buttons,
with the following interpretation:

left button   - picks menu functions and applies 
  them to drawing areas or windows, appropriately.
  Because of Autograph multiwindow management, the
  user is required to click inside the window to
  which a window function should apply (Save, for
  instance).

middle button - moves all kind of objects, 
  including labels. When a current selection 
  exists, moving a selected object will move them
  all.

right button  - selects or unselects objects, in a
  toggle fashion. Dragging the mouse down will
  (un)selectall objects in the shadow rectangle
  area. Clicking outside any object removes all
  selections.

WARNING: not yet implemented:
Keyboard shorthands may  be used to select
left button functions without browsing through
the menus .