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root --+
       |
       +--- client page
       |
       +--- email page

Vlad --> 
     Node: /root
...
Sam  -->
     Node: /root/email page
     Permission: 'All'

use GUMS;
# initialize DBI database...
...
unless ($res) {
   print "$user_name lacks 'Edit' permission to access/use this page.\
+n";
}

# Under Construction