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$_session["valid_user"] 

VALUES: 0 or 1;

FUNCTION: This variable determines whether the user is allowed to view the content of the
db, if set to 0 it will always bring the user to the login page.

PAGE: includes/checklogin.inc.php
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THESE ARE PART OF get_group_info.inc.php 
 
$ADDUSER = $ROWpermissions["ath_groups_addUSERS"];
$VIEWUSERS = $ROWpermissions["ath_groups_viewUSERS"];

$ADDGROUPS = $ROWpermissions["ath_groups_addGROUPS"];
$VIEWGROUPS = $ROWpermissions["ath_groups_viewGROUPS"];

$ADDPROJECT = $ROWpermissions["ath_groups_addPROJECT"];
$ADDNOTES = $ROWpermissions["ath_groups_addNOTES"];
$ADDRESRC = $ROWpermissions["ath_groups_addRESRC"];
$ADDTOPUBLIC = $ROWpermissions["ath_groups_addtoPUBLIC"];

$ADMINISTRATE = $ROWpermissions["ath_groups_ADMINISTRATE"];