Well you got the first part right. Opening and closing the tool helper turns the tool helper on and off.
As for what it does it depends on the tool you is usin
Parallel Plotters: If you select and use the parallel plotters with no tool help you will just draw a line
With tool helper on you will have a compass rose to help (get it!) you draw the correct line
Two point compass: no difference between tool help and off
Marker: no difference between tool help on or off
Zoom: no difference between tool help on or off
Protractor:If you select and use the protractor with no tool help you will just draw the angle lines
With tool helper on you will have a compass rose to help you draw the correct lines
So the bottom line is that the tool helper gives you a compass rose to help you draw lines. Either straight lines or pairs of lines for angles.
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abusus non tollit usum - A right should NOT be withheld from people on the basis that some tend to abuse that right.
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