Qs about renaming directories

[Irving Kimura]

1. In the directory renaming section, the cvs docs say

  It is almost always better to move the files in the directory
  instead of moving the directory.

What exactly does this mean?  Does mean that rather than renaming
the directory OLD-DIR to NEW-DIR, it is better to create NEW-DIR
(leaving OLD-DIR in place), and rename all the files OLD-DIR/* to
NEW_DIR/* (thereby leaving OLD-DIR empty, except for OLD-DIR/CVS)?


2. Right after the sentence quoted above, the documentation says

  If you move the directory you are unlikely to be able to retrieve
  old releases correctly, since they probably depend on the name
  of the directories.

What does this mean?  Can someone give me an example in which it
would not be possible to retrieve old releases correctly?  Is this
true even if one uses tags to retrieve older releases?

Thanks!

Irv