A parallel, fault-tolerant computer system in which data is transferred between processes in a single CPU by two methods. Illustratively, a computing environment comprises a DIP monitoring engine cooperating with a DIP monitoring table that aggregates and processes data representative of the effectiveness of DIP on recently executed jump instructions. For improved sound radiation capability, the size and the shape of the enhancer can be modified in various ways, including a frustoconical, parabolic, or bell-shaped enhancer. Since a person can be exposed to a variety of physical threats on any given day, the personal alert device carried by the user provides reliable detection of a possible physical threat, and by generating an alert message the user receives a recommended course of action to avoid the possible physical threat.