The connectors at this level inherit attributes from their source-code structure counterparts, along with the following other attributes:
Multiplicity: One element can be connected to multiple elements if it needs to invoke methods of multiple elements at runtime.
Distance and connection media: Two connected elements may communicate in the same thread, in the same process, on the same computer, or on different computers across a network. Based on the distance between two elements, the communication media may vary from copper/optical cable or wireless based LAN to the Internet.
Universally invocable: A connector with this attribute set to true allows any external software system, no matter what hardware/ software platforms they run on and in which programming languages or software frameworks they are developed, to invoke the method at the connector's target. This attribute is critical for heterogeneous enterprise information systems that must be integrated efficiently.