Linux group admin question.

[byrdca at gmail.com]

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.