System Security: Tracking unsuccessful logins

[Pat "that's doctor to you" Martin]

Hi...

I'm currently trying to learn all I can about accounting within UNIX, but
I find the manuals a bit difficult to sift through.  I am trying to analyze
system usage of our IRIS, and was wondering about logging of unsuccessful
login attempts.  Is this a standard function of the UNIX accounting software,
or will I need to generate my own code?

Thanks.
..pkm
Patrick Martin
martin at slsiris.harvard.edu