Pre-Process Root Directory:
On some systems, it is possible to designate a directory that, will serve as the root directory for a process. Once this designation occurs, only the subtree headed by that directory is visible to the process. On a system where file-sharing is desirable, each user's home directory could be made the root directory for all processes the user executes. The root of the file system would be the user's home directory to those processes. This capability may also be used by applications to provide additional security.
