1. A data processing system comprising: A. means for receiving an instruction designating the switching of the operating mode of a process from a first mode to a specified function in a second mode, wherein said first mode is the native mode of said system during which processes are executed in the normal manner intended by said system, and wherein said second mode is the non-native mode of said system; B. a plurality of first means for indicating, the contents of each of which indicate the operational state of a said process at any specified time, said plurality of said first means for indicating equal in number to the number of processes included and capable of execution in said system; C. a plurality of second means responsive to said means for receiving for indicating the executability of said specified function in said system, wherein each of said second means for indicating includes a plurality of indicia, each for indicating the executability of different specified functions in said system, wherein said specified function is indicated by a number in a first portion of said instruction; D means for addressing said second means for indicating with a first portion of the contents of said first means for indicating; E. means coupled to said means for receiving for addressing one of said indicia in the addressed second means for indicating by the number indicated in said first portion of the contents of said instruction; F. means for activating said specified function for said process in said second mode if said second means for indicating indicates that said specified function is executable in said system; G. means for generating a first signal if the number indicated by said first portion of the contents of said instruction is greater than a number indicated by a portion of the contents of said first means for indicating; and H. means, responsive to said first signal, for disabling said means for activating such that said specified function for said process in said non-native mode will not be executed in said system.