Georges Heinesch <ghmlist@ibm.net> wrote:
[..]
>If you start X as root, let's say with 3 xterm windows, and then you
>change user in one xterm window ('su -l iuser'), is this xterm window
>then consinderd to belong to root or to user?

No.  The xterm process still belongs root, only the forked shell belongs
to iuser. 

>When I do this, I continue to get system messages to the xterm window
>I changed user.

So this behaviour is normal.

Yours,

    Michael B"ohnisch