A click on a line, shows graphically
this elementReferenced operations
It's the list of the elements which serve of references for the control operation.
Every line represents a reference.
The line of green colour represents the element to be controlled , and the line of red colour represents the reference element.
The referenced elements are necessarily situated before this control in the list of operations.
A click on a line, shows graphically
this element
A double click on a same line, allows to simulate this operation.
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