[README.utmp]

The utmp support provided with konsole is established
by a separate program, kwrited. This program is expected
to be started in startkde and runs as a demon.

kwrited stamps the utmp and pops up when something comes
in on the device it is lurking on.

You have to have the utempter library installed prior of
configuring the kdebase package, to make the utmp support
work.

The utempter library is available at
ftp://ftp.redhat.com/redhat/redhat-6.0/SRPMS/SRPMS/utempter-0.5-1.src.rpm
and has some demands. The "utempter" program must be set
root/setuid and installed in /usr/sbin.

Use who(1) or utmp (included in the utempter distribution)
to see the entries. Try write(1) or wall(1) to see the 
whole construction in action.