The hard part was that every­thing was new at the same time. There was new hard­ware. There were new pro­to­cols. There was a new imple­men­ta­tion of pro­to­cols in the oper­at­ing sys­tem. It was actu­al­ly dif­fi­cult to fig­ure out how to build pro­to­col soft­ware in the oper­at­ing sys­tems. We had new appli­ca­tions. Things that…you have to under­stand at the time peo­ple did­n’t use net­works. So every­thing was being done at the same time.