US trade representative Clayton Yeutter, in London this week, has been sounding off about one of the US adminsitration’s biggest trade bug-bears, Brazil’s refusal to open its market to computer imports – and the coffee-growers may just have gone too far this time: Brazil has decided that Sisne, which sounds like a name dreamed up by one of the rude mechanicals in A Midsummer Night’s Dream but is in fact an MS-DOS clone developed by Scopus Technology, is an acceptable substitute for the Real Thing from Microsoft Corp – Scopus reportedly admits that some of the code was copied – and has banned MS-DOS from being sold in Brazil; Washington is expected to dispatch the trade equivalent of a gunboat next week.