I have a couple of question about installing packages:

1.How can I add my RHEL or centos installation CD as a repository for
yum? I noticed that whenever I try to use yum I get the packages from
the internet but not from my CD.
2.After adding the CD as a repository how can I give the CD priority
to ensure that if a packages is available on both my CD and the redhat
network I don’t end up downloading a package that I already have
locally in my disk.
3. On gnome I used to “add and remove software” tool on the
application menu. From there I was able to find openoffice. However
with a “yum –info openoffice” I get nothing. Why is that?