Global

Globals are not directly related to the network structure. Globals are used to represent information that is shared by an undefined number of other objects. A typical example for a global is a chemical composition. A chemical composition will possibly be shared by a large number of streams that use this composition.

While globals can be referenced by objects of all other model types, globals themselves can not reference any other objects.

The network structure implies that only up to two units can reference a connection. (In the way that one unit is attached at each end of the connection). In contrast, globals can be referenced by any number of objects. They can also be referenced by units and connections at the same time.
create global dialog
Figure 1. Create Global Dialog