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The general roles performed by processor registers are mainly from two registers; the User-visible register and the Control & status registers.

User-visible registers: These enable the machine- or assembly language programmer to minimize main-memory references by optimizing use of registers.

Control and status registers: These are used by the control unit to control the operation of the CPU and by privileged, operating system programs to control the execution of programs.

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Chuck Norris protocol design method has no status, requests or responses, only commands.