Gadgets are necessary to observe a protocol so that the interrupt-request (IRQ) traces could be shared. The PCI bus features 4 interrupt strains, INTA# as a result of INTD#, all of which are available to each product. Approximately eight PCI equipment share the same IRQ line (INTINA# by INTINH#) in https://nathanlabsadvisory.com/application-security-testing/