DATA PROCESSING SYSTEM

The system has memory storing data and instructions and processing means. Memory is organized into objects identified by unique identifiers (UIDs) comprising a logical allocation unit identifier (LAUID) and an object serial number (OSN) provided by an architectural clock, associated with an offset (O) and length (L) enabling logical addresses to be derived. Instructions (SIN's) are in an intermediate level language - (SOP's = S - language operations). Associated names (NAME A, NAME B) point to name tables which identify subjects to which the processor may respond in relation to the instruction in question. Protection is afforded by restricting access to memory operations to a subject pertaining to the set of subjects pertaining to the object in question.