The use of atomic weapons at the end of World War 2 fostered fears about their potential use during the Cold War years.
Interrupts and signals are low-level mechanisms that can alter the flow of control in a way similar to a subroutine, but usually occur as a response to some external stimulus or event (that can occur asynchronously), rather than execution of an 'in-line' control flow statement.
Cargo control document The transportation company or forwarder will send you a cargo control document to inform you that a shipment has arrived and is awaiting customs clearance. The cargo control document can be a manifest, a waybill or other approved document covering the transportation of the shipment. For more information on the cargo control document, see Memorandum D3-1-1.