In most situations, information is transferred between elements (via links) continuously in time. For example, if Expression element A function element that produces a single output by calculating user-specified mathematical expressions. X is defined as being equal to A + B, the values of A and B are continuously sent to X (i.e., the information is "broadcast" through the link throughout the simulation). Conceptually, at any given time in the simulation, X is receiving a signal from A and B.
In order to propagate discrete events (and their
consequences) between elements in a model, however, it is necessary to send
information between elements intermittently as a "spike" or discrete "packet" of
information. To facilitate this, GoldSim allows certain elements to emit and
receive (i.e., produce as outputs and/or accept as inputs) a