repeated entries in /var/log/messages...

[Mario Flores <marioflores@verizon.net>]

Hi:

Since day 1 I installed debian, I see the following in the 
/var/log/messages:

Jul 28 21:01:08 woody -- MARK --
Jul 28 21:21:08 woody -- MARK --
Jul 28 21:41:08 woody -- MARK --

and they repeat every single hour at the exact same intervals. Does 
anyone know what they mean and how can I stop them?

I am running the stable release (woody).

Thanks,

Mario.