82. The method of claim 79 wherein said user is a member of at least two groups each with distinct read and write privileges.
82. The method of claim 79 wherein said user is a member of at least two groups each with distinct read and write privileges. 84. The method of claim 82 , further comprising: performing link analysis of a subgraph that encompasses all documents available to a first of said at least two groups under a corresponding first read permission; and performing link analysis of a subgraph that encompasses all documents available to a second of said at least two groups under a corresponding second read permission.