What is command to setup sofware in redhat over internet

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http://www.unix.com – Hi all, I setup redhat in VMware and I connected to internet, so I want setup sofware for redhat over internet what is command I used ? Are you understand my question, my ability of english is not good, such as I want setup dhcp packet I must used a command ? (yum... or...apt-get...or rpm... ? thank for help. (HowTos)