Upgrading Slackware

[Francisco Matias Cuenca Acu�a]

How can I upgrade my slackware 3.3 to 3.5? I have patched the kernel many
times, but I think it's time to upgrade the whole set of utilities. I have
made many customization to my system and I don't wanna lose them. What can
I read? When can I find more info. on the subject?
        Thanks
                        Matias 
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Francisco Matias Cuenca Acu�a
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