1.1 General Description
 1.2 System Requirements
 1.3 Concept of usage
 1.4 Short reference
  1.4.1 Navigation
  1.4.2 Selection of objects
  1.4.3 Deselecting objects
  1.4.4 Construction of free points
  1.4.5 Object construction
  1.4.6 Measure and calculate
  1.4.7 Slider
  1.4.8 Defining functions
  1.4.9 Macros