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# View the contents of the DVD drive using the file manager application (called '''nautilus'''). Change to the Packages subdirectory. What does this subdirectory contain?
# Use a graphical file manager to view the contents of the DVD in your machine.<br><br>'''TIP:''' If you are having problems locating pathname to your DVD, open a terminal, login as '''root''', issue the command: '''mount''', and look for a path-name containing your Centos Install DVD and use that path-name when required later in this section.<br><br>
# Open a shell terminal and use the Linux command '''cd''' to change to the '''Packages''' sub-directory (hint: similar path-name as USB, but use '''Centos 7 x86_64/Packages''' and use '''quotes''' " " around full path-name since there are spaces within the pathname).<br>There are a few ways for yum to install applications:<ul><li>'''yum localinstall''' (install rpm files located from the machine via downloads to hard-drive, DVD, etc)</li><li>'''yum install''' (install applications from an online repository)<br><br></li></ul>{| width="40%" align="right" cellpadding="10"|- valign="top"|colspan="2"|{{Admon/note|A Note about Repositories|Since software repositories are on-line storage areas for software for particular Linux distributions, the Linux administrator can enable (add) or disable (remove) additional software repositories. Usually only the basic or "base" repositories are enabled upon Linux installation.}}|}
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<li value="11">Within the '''Packages''' subdirectory of the '''Centos7 Full Install DVD''', locate the '''rpm''' file that contains the '''xchat''' application (note the full path-name of the file). What do you think is the purpose of the numbers also contained in the filename?</li>