NFS is the most commonly used technology for sharing files between computers running Unix/FreeBSD/Linux/Solaris/etc.
NFS is not supported by Microsoft, but is available with commercial add-ins. It is present in most Linux/Unix distributions. Unix to Windows file connectivity is often provided by SMB (also known as Samba or CIFS) -- a Microsoft file sharing technology -- rather than NFS.
In early years, NFS was known informally as the "Nightmare File System" largely because of an unfortunate phenomenon wherein a computer would go down, locking tasks on any computers waiting for file accesses on the defunct computer. That, in turn, locked up computers waiting for access to the locked computers, which, in turn ... This is no longer a significant issue.
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