PLEASE HELP!!! ANYONE???? Can i move the dashboard (admin) login to another after installation?

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I have a Zend website that's has certain sections being converted to use concrete5. I'm forwarding to concrete5 or Zend per the pages I choose in the index page. However, they have an existing dashboard section of the site that will not be part of concrete5. So I have a conflict. I know most would say to just rename the Zend portion of code because that's easy enough. However, many users have already saved this URL and will get confused because they'll magically see the concrete 5 log in instead of their original log in. But, if I allow the Zend dashboard to take precedence, then the Zend section won't show. So, my only solution is to rename the entire concrete5 admin section to something like cms or cms-admin.

I tried renaming concrete/config/base.php line 170 from define('DIRNAME_DASHBOARD', 'dashboard'); to define('DIRNAME_DASHBOARD', 'cms'); DIDN'T WORK!

Any help would be greatly appreciated.