Unlike NTFS symbolic links Junction points can only link to a local volume; junction points to remote shares are unsupported.
Junction points are a type of NTFS reparse point. They were introduced with NTFS 3.0, the default file system for Windows 2000. The Windows 2000 and Windows 2003Resource Kits include a program called linkd, to create junction points; Mark Russinovich of Winternals released a tool called junction which provided more complete functionality. Windows XP includes "fsutil";Masatoshi Kimura released a filter driver for the soft/symbolic link functionality existing in Windows XP's NTFS version, to be accessible to the end user. Windows Vista, Windows Server 2008, and later operating systems include an mklink command-line utility for creating junction points.