Microsoft Corp co-founder Paul Allen plans to buy nearly 1.5% of Attachmate Corp when it goes public, according to a prospectus statement released by Attachmate: it said the entrepreneur has committed to buying 450,000 shares of the 6.75m shares it expects to offer to the public; at an anticipated offering price of $13 to $15 a share, his investment would total $6m to $7m; Attachmate, based in Bellevue, Washington, develops software that enables personal computers to be connected to mainframes, minicomputers and networks, which it is suggested could be useful in Allen’s vision of an increasingly wired world in which individuals have access to vast banks of data.