Interprocess communication on multi-user machine

[Lawrence D'Oliveiro]

In article <44a41cae$0$29145$9b4e6d93 at newsread4.arcor-online.net>,
 Michael Butscher <mbutscher at gmx.de> wrote:

>Normally any user could connect to an open socket on a machine 
>regardless which user established the socket (the user's program, to be 
>precise). 

That's not true. On *nix systems, a socket is a file, and is subject to 
the usual file ownership and protection mechanisms.