1. A method for detecting and eliminating SCR breach operations by a second party within the memory space allocated to a first party, in a multi-tasking system, comprising: a. Pre-recording by said first party within a knowledge base the structure and/or behavior of an SCR stack; b. Implanting within the SCR stack a dedicated SCR for reporting on the structure and/or behavior of said SCR stack when said SCR stack is activated; c. When said SCR stack is activated, comparing the data reported by said dedicated SCR with the said pre-recorded stack structure and/or behavior; and d. Whenever non-matching in the structure and/or behavior is found step c, ceasing the activity of said activated stack, and alerting.