Reserved Ports and non-superuser Daemons

[Arrav <guymor93 () gmail com>]

Hello,

The book UNIX Socket Programming 3d edition volume one specifies that
in UNIX, ports between 0 - 1023 are reserved ports, and can only be 
used by a program running with super user privs.
I know lots of servers are binding to ports beneath 1024, and they
obviously don't have root privileges since this would be stupid
security wise. I also don't believe they have the suid bit on, 
because of the same issue.

I wonder if someone could explain that to me.

Thanks,

        Guy.