Introduction - If you have any usage issues, please Google them yourself
Intel' s CPU privilege level will be divided into four levels: RING0, RING1, RING2, RING3. Windows uses only one of the two levels RING0 and RING3, RING0 only to the operating system used, RING3 anyone can. If the application attempts to execute common commands RING0, Windows will display " Illegal Instruction" error message.