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If you would like to use SLiM as the login manager in runlevel 4, add the following lines to /etc/rc.d/rc.4 just above the section that tries to start gdm:

  # Try to use SLiM login manager.  This comes first, because if SLiM is 
  # installed, then the user probably wants to use it by default:
  if [ -x /usr/bin/slim ]; then
    exec /usr/bin/slim
  fi

edit /etc/inittab and change the line that reads

id:3:initdefault:

and change it to read

id:4:initdefault:

once done with the about you have to run

xwmconfig

Frank Caraballo took the time to create a custom Slackware theme which goes nicely with the lilo boot theme. If you would like to use Frank's theme, you will need to edit /etc/slim.conf and change the 'current_theme' directive from 'default' to 'slackware-black'.

you can also download more themes and put them in /usr/share/slim/themes and change the current_theme value in /etc/slim.conf