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Sessions and Process Groups

The ability to observe or set the session and process group identifiers of other processes is controlled by Flask, but the session and process group abstractions are not labeled or controlled. The Flask mechanisms could be used to provide a label for each session and process group, to control what processes may be in each process group, and to control what terminal may serve as the controlling terminal for each process group. However, it is not clear that such labeling and controls are needed, since signal delivery and terminal access are controlled through the existing Flask signal and file controls. Further study of the use of session and process groups is needed.