Absolute Linux is a lightweight modification of Slackware Linux. It does not change how Slackware works, it just includes utilities that make configuration and maintenance easier. So if you are familiar with Slackware, you can still do all the configuration the old-fashioned way if you like.
While being completely configurable for those with the knowledge and inclination, Absolute Linux is a usable and productive "out of the box" for anyone; because of small, single-purpose applications and utilities that help get things done. This takes away a huge learning curve for those unfamiliar to the ways of Linux and Slackware.
Absolute Linux is for desktop-oriented users who value speed, stability, security, ease of use and development.