Hi alexking,
You can add as many session variables as you want but you will need to do the assignment from code view.
A session is as simple as:
$_SESSION['whatever'] = whatever;
So if you have the recordset for the user with UniqueID in it, the following PHP assigns the variable:
$_SESSION['theUniqueID'] = $row_yourrecordset['UniqueID'];
obviously substituting the correct column and recordset names above...