Flux wrote
Can the users/groups in the abyss console configuration be accessed and used as sessions by scripts on the server?
This could be done but in such a case, it's better to have your own user/groups system in yoru scripts. This is what scripts such as PhpBB do (they implement their own user/group policy/validation/storage/session system).
The user/groups feature available in Abyss Web Server is meant to quickly protect some files or directories.