What is MARK in /var/log/messages

[news.andy@spiegl.de (Andy Spiegl)]

Hi!

In my /var/log/messages there are a lot of lines like this one:
 Sep  9 14:56:58 kira -- MARK --

A new one every 20 minutes to be exact.  But I don't see any cron
job that runs every 20 minutes.

Who knows who writes this and what it means?

TIA,
 Andy.

-- 
 Andy Spiegl, University of Technology, Muenchen, Germany
 E-Mail: Andy@spiegl.de     URL: http://www.spiegl.de
 PGP fingerprint: B8 48 24 7B DB 96 6F 1C  D9 6D 8E 6C DB C2 E7 E9
                                o      _     _         _
  --------- __o       __o      /\_   _ \\o  (_)\__/o  (_)
  ------- _`\<,_    _`\<,_    _>(_) (_)/<_    \_| \   _|/' \/
  ------ (_)/ (_)  (_)/ (_)  (_)        (_)   (_)    (_)'  _\o_
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~