It’s been a long time a’borning – PC Letter editor Stewart Alsop has had it on his list of vapourware for a record 46 months and it will have clocked up more than four years by the time it ships in the autumn – but Lotus Development Corp is finally just about ready with its promised 1-2-3 for the Apple Computer Inc Macintosh, which it is expected to preview at its annual meeting today: the program, which has a long haul in its effort to rein in the runaway winner in the Macintosh market, Microsoft Corp’s Excel, is said to include the Backsolver feature favoured by people trying to cook their expenses, it will exchange files with the MS-DOS versions, have three-dimensional file links, and will make use of the features of Macintosh System 7.