Nodes can be connected by dragging the connector (the round decoration at the top of the node) onto another node. If no connection is possible (for example, actors cannot be connected directly to a wireless link), both nodes will flash briefly and no connection will be made. With connections you can:
Connections cannot be moved; they automatically follow the two nodes that they connect.
It is possible to have more connections than allowed by the connection rules for that node type (see Telecommunication service diagrams). This may be useful during editing You will need to remove extra connections later on, for the diagram to be valid. Meanwhile, the node will show a warning triangle.