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...Note on cpu terminology tpf originated for single systems some has diverged from common ibm architecture in z terms a contains the sequencing and processing facilities instruction execution interruption action timing functions multiple cpus system can run concurrently term is an stream or i includes main storage one more channel subsystem o devices often refers to using confusing each given alphanumeric character as identifier called id e g corporation entry control block ecb associated with input message end user area of assigned use both application work this are cornerstone program re entrant structure allows entries because private code considered be synonymous command operator time initiated utility routine task spun off another executed asynchronously linked typically maintains record resources used serves interface between other controlled programs provides executes ec s multiprogram level by many ecbs cannot self modifying unique data kept yes model characteristics process thre...