Equipment are necessary to observe a protocol so the interrupt-ask for (IRQ) traces is often shared. The PCI bus incorporates 4 interrupt lines, INTA# by means of INTD#, all of which can be found to each machine. Approximately 8 PCI devices share precisely the same IRQ line (INTINA# via INTINH#) https://nathanlabsadvisory.com/cybersecurity-fintechs/