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Figure 5: Group selecting
Right click on a node to bring up a context menu, from which you can choose what
operations to perform on that node. Click anywhere else to make it disappear.
Figure 6: Context menu
A port is a small square aligned on the left or right sides of a node. Initially they are
named like “left n” or “right n”, where n is the index. You can manually change the name
of a port through “SET LEFT/RIGHT PORTS” options in right click context menu.
Now click on port “right 0” of the node on the left, hold your mouse button down and
drag an arrow to the port “left 0” of the node on the right. Release mouse and an arc is
created. A solid line indicates a data dependency (target depends on data from source),
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