Footnotes
-  (1)
- That means, 
being able to create some type of object from a single command 
but through different modalities.
For instance, with the circle-building command,
the user can create a circle from its center and another point 
or a length, or from a segment, etc.
Of course, this command is represented by a single icon, 
and DR. GEO is expected to anticipate the user's construction. 
The immediate consequence is a reduction 
of the interface-learning burden for the user, 
while a large number of construction modes are offered.
  
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