Microsoft Corp’s Bill Gates this week reiterated that his company would be offering an implementation of its Presentation Manager graphical user interface from OS/2 as a front-end for Unix, in a move that will further muddy the Unix user interface waters. IBM has adopted NeXT Inc’s NeXTStep user interface for its own AIX implementations, and insists that Presentation should only be for OS/2, although it says that there will be a high level of transportability between Presentation Manager and NeXTStep. When last it spoke on the subject, Hewlett-Packard Co said it would be adopting Presentation Manager as the front-end for its Unix offerings, but has since said that it will dump any development of its own that conflicts with Open Software Foundation standards. The Foundation is choosing a user interface, unlikely to be either Presentation Manager or NeXTStep. AT&T Co and Sun Microsystems plan another, Open Look, for Unix System V.4.