Do not ressurrect a years-old thread. It is considered to go against LinuxQuestions etiquette.
Second, you do not ask an actual question here. What is your context? What are you trying to achive?
Third, your question (if this is indeed a question about how to upgrade a system) has no relevance to the topic of this thread. You should have opened a new thread or asked this question in the thread where your quote comes from.
Fourth, read the fine manual before asking: http://docs.slackware.com/howtos:sla...considerations