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From the point that the host subsystem is powered on and begins executing code, BIOS code is executed. The sequence BIOS goes through from the first point that code is executed to the point that the operating system booting begins is referred to as POST (power-on self-test). POST works in conjunction with other processes to complete initialization of the host system prior to booting. During the host initialization process, if failures occur, the failures are communicated to the service processor (SP) for analysis and logging.