In the marketplace, however, these concerns made little difference. Netscape Navigator remained the market leader with more than 50% usage share. The browser software was available for a wide range of operating systems, including Windows (3.1, 95, 98, NT), Macintosh, Linux, OS/2, and many versions of Unix including OSF/1, Sun Solaris, BSD/OS, IRIX, AIX, and HP-UX, and looked and worked nearly identically on every one of them. Netscape began to experiment with prototypes of a web-based system, known internally as "Constellation", which would allow a user to access and edit his or her files anywhere across a network no matter what computer or operating system he or she happened to be using.