How-to auto-start programmes when I connect to Internet?

[Coume - Lubox.com]

> On Fri, Feb 13, 2004 at 02:19:37PM +0100, Coume - Lubox.com wrote:
> > Hello,
> > I would like to know if it is possible to auto-start programmes, when I
> > have my eth0 cable plugged in.
> > For instance, to start amsn, licq and other things like that, as soon as
> > my eth0 connexion is up.
> 
> Sure, write a script that checks for connection, and restarts whatever
> you want it to.

Could you explain a bit more? Because I do not know how to do what you told me... :(

thxs
Ludo