1. A multiprocessor computer system comprising: plural nodes, including first and second nodes, each node having at least one combination of a processor and a TLB; and plural memory locations for storing TLB-shootdown data, said locations including first and second locations so that, in the event said second node issues a second request for a TLB shootdown at the same time or after said first node issues a first request for a TLB shootdown but before said first request is fulfilled, said first location stores TLB-shootdown data specified by said first node while said second location stores TLB-shootdown data specified by said second node.