A bit of a conceptual question. Can anyone inform me about the functional difference between a system group (GID < 500) and a non-system group (GID>=500). I understand that if I'm creating a group like the classic "accounting" to which I will add general users so that they can share accounting files I should use a non-system group. The question is, is there any fundamental difference other than GID range between a system group and a non-system group i.e. when the system is determining if a user has permission to rwx a file? Thanks for the help.