I have been writing about the sweet little tool Junctions before but it got somehow lost among more popular articles back then and I decided to give it another try. A Directory Symbolic Link is a link from another drive or directory to an existing directory. NTFS Junctions could be used for instance to access the folder d:\mp3 from a symbolic link in c:\mp3.
Junction
If you are using linux you might know the symbolic link functionality which allows you to create a (symbolic) link between two directories. A little freeware tool called junction from sysinternals adds this functionality to windows.
