Gadgets are needed to observe a protocol so that the interrupt-request (IRQ) traces may be shared. The PCI bus includes four interrupt traces, INTA# via INTD#, all of which can be obtained to every system. Around eight PCI products share precisely the same IRQ line (INTINA# via INTINH#) in APIC-enabled https://nathanlabsadvisory.com/key-components-of-a-successful-incident-response-strategy/