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5,487,131 A 1/1996 Kassatly et al............... 395/62 alities as sequential events. Each of these functionalities has 5,499,340 A 3/1996 Barritz......... 395/184.01 a characteristic Set of modules that is executed to implement 5,528,753 A 6/1996 Fortin................... 395/183.11 the functionality. These module Sets execute with clearly 5,539.907 A 7/1996 Srivastava et al........... 395/700 defined and measurable execution profiles, which change as 5,557,742 A 9/1996 Smaha et al........... 395/186 the executed functionalities change. Over time, the normal 5,581,482. A 12/1996 Wiedenman et al.... 364/551.01 behavior of the system will be defined by the boundary of