No detailed help for Redirect choices

Here are the Redirect choices in the control panel:
(I am asking with reference to subdomains)

The client will be sent to:

  • The exact URL entered above
  • A directory below this one
  • A permanent redirection for this resource

While I can understand the first option, I don’t understand the
second and third one. Can you give an example each of how
they would work and why they may be necessary?

Thanks.

It appears you did not notice the link http://cp.jodohost.com:8080/psoft/servlet/psoft.hsphere.CP/managedacc/160677_0/psoft.hsphere.CP?rid=362165_9&aid=362165_9&mod=&type=redirect_url&stemplate=quick/choice_redirect.html&ftemplate=quick/choice_redirect.html&next_template=windomain/add_redirect.html&template_name=submit/misc/add_check.sbm&cur_menuid=acct-pref# , in the ToolTip on right side. It has details on three options.

Thanks. I got it. It would have been nice to include this link in the main help too. It never appears there.