A link can be created between two objects. Also a link has its direction from the initial object to the destination object.
Before creating a link it is necessary to turn on the link creation mode by one of the following ways:
The same ways can be used to turn the mode off.
When the mode is activated:
In order to create a link, click the left mouse button on the link creation icon of the initial object, and drag the mouse cursor to the destination object holding the button.
Waypoints can make a link more convenient for perception. In order to add a waypoint put the mouse cursor over the link and drag the mouse cursor to any direction holding the button:
A waypoint can be moved by the same algorithm.
To delete a waypoint put the mouse cursor over it and press the appeared button :