MS IIS logs, anyone?

[Thomas Dowling]

Greetings, Web4Lib--

I have a machine running Microsoft Internet Information Server 3.0,
creating logs in IIS standard format (as opposed to NCSA format).  I'm
trying to understand what the logs are telling me.  The documentation is
pretty clear, except that my logs have an extra field at the end of every
line that isn't documented.  That is, if a line reads...

    192.153.30.101, -, 3/6/97, 15:39:22, W3SVC,
      GOLD, 192.153.30.102, 120, 290, 2435, 200, 
      0, GET, /db/Default.htm, -,

...the manual tells me about everything except that last cryptic hyphen
(and it's always a hyphen).  Does anyone know what it is?

Thomas Dowling
Ohio Library and Information Network
tdowling at ohiolink.edu