To make a bootable Slackware CD, get into the top level Slackware directory
(The one with ChangeLog.txt in it) and issue a command like this to build
the ISO image in /tmp:

mkisofs -o /tmp/slack.iso -R -V "Slackware Install" -v -a \
-T -d -D -N \
-b .eltorito/eltorito.img \
-c .eltorito/eltorito.boot \
-A "Slackware Linux" .

(this command will create the '.eltorito/eltorito.boot' boot record)

The use 'cdrecord' to burn it.  (See 'man cdrecord')

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notes:
  No, we won't just put ISO images up for FTP.
  If you want to master/burn the ISO image under Windows, you're on your own.