Encapsulated subsystems

A subsystem which works with its own global data can encapsulate itself.

This has the following advantages:

• The subsystem is independent of the various versions of a component which may be present both in the environment and in the subsystem.

• The internal statuses of the language runtime systems of the application and the subsystem do not interfere with one another.

At the same time, encapsulation imposes the following restrictions:

• Global jumps (e.g. longjump in C) from the subsystem to the application are not possible.

• Events from the subsystem cannot be propagated to the application.