Owner`s manual

You use the console terminal to control the system manually, correct errors,
determine the status of machine registers and counters, determine the
contents of storage, and revise the contents of storage.
Following self-test or a SET CPU console command, one processor in a
multiprocessor system is designated as the primary or boot processor. The
location of the primary processor is determined at startup or when the
system is reset. The primary processor performs a bootstrap or warm
restart of the system. The operating system controls the other processors
from the primary processor.
Nonprimary processors are called secondary processors. Secondary
processors communicate with the console terminal through the primary
processor when performing I/O during a console session. For information
on how the primary processor is determined, see Section 4.5.
Appendix G gives a summary list of each console command and its
functions.
Console 5–5