Coral Springs, Florida-based Citrix Systems Inc has so far not made much of an impact in the market with its multi-user versions of personal computer operating systems, notably the Multiuser version of OS/2, which uses code licensed from Microsoft Corp – but Microsoft reckons that the company may have something anyway, and has now signed a strategic alliance agreement with Citrix. The agreement calls for the two companies to co-operate on continued development of Citrix products that provide multi-user and network extensions for future Microsoft operating systems, notably Windows NT. The new Multiuser 2.0 gives users simultaneous access to MS-DOS, Windows and OS/2 applications in a multi-user environment. Citrix now plans to do multi-user and network extensions for Windows NT.