Palo Alto, California-based J Frank & Associates last week announced MVS/NFS, a software product co-developed with Sun Microsystems Inc and designed to increase data sharing between mainframes and workstations through on-line access to MVS files from Network File System networks. It is a full implementation of Network File System under MVS bridging mainframes and Unix networks and from there to other Network File System machines such as MS-DOS personal computers, Macs and VAXs. Workstation users can access and create files on the mainframe without knowing MVS or compromising MVS security, effectively making the mainframe a huge file server. MVS/NFS ships this month at from $18,000 to $62,000.