IBM has expanded on its relationship with handprint-operated portable computer start-up Go Corp, saying that it had licensed the operating environment Go has devloped to control pen-operated computers. Other companies in that market have designed their machines for MS-DOS, but Go insists that such machines require a completely new operating environment. Companies doing software for the planned environment include Borland International, Lotus Development Corp, WordPerfect Corp., Slate Corp and PenSoft Corp. IBM and Go will co-operate on pilot projects for applications such as marking up and editing documents in consultation with a client; electronic drawing pads for architects, artists and designers; database access while talking with a customer; and the processing of electronic mail.