A Concurrent Region is an “orthogonal
conjunctive” component of a composite state, allowing
concurrency to be constructed.
A concurrent region is represented on the diagram by a
tile of a composite state, separated from other regions by a
ArgoUML currently only supports a horizontal division of
a concurrent composite state in regions.
The description of the details panels of a concurrent
region is identical to that of a composite state (see
Section 20.4, “Composite State” and so is not