VME formed a core of ICL's activities in the Secure Systems arena. It had the advantage that as the last large-scale operating system ever designed, and one built from scratch, its underlying architecture encompassed many of the primitives needed to develop a Secure System, in particular the hardware assisted Access Control Registers (ACR) to limit to privileges that could be taken by any process (including Users).
VME formed a core ,of ICL's activities in the Secure Systems arena It had the advantage that as the last large-scale operating sy.stem ever designed, and one built from scratch its underlying architectur,e encompassed many of the primitives needed to develop a Secure System in particular the hardware assisted Access Control Registers (ACR) to limit to privileges that could be taken by any process (including Users).