work paralell with both side in the same browser
ISSUE: admin side will use the same session id as store and after every shop activity will be destroy active login on admin site.
case B:
Open a browser
jump into admin side
open a new browser tab
jump into shop side
work paralell with both side in the same browser
No session mixing
https://github.com/osCommerce/oscommerce2/blob/de0e97d15d43ac6a9a6cfb2847134a82a0148f2b/catalog/includes/OSC/Sites/Admin/Admin.php#L64
case A:
case B: