# yum info screen.x86_64
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drivesrvr                                                                                                          | 2.2 kB     00:00     
Available Packages
Name        : screen
Arch        : x86_64
Version     : 4.0.3
Release     : 18.el6
Size        : 494 k
Repo        : base
Summary     : A screen manager that supports multiple logins on one terminal
URL         : http://www.gnu.org/software/screen
License     : GPLv2+
Description : The screen utility allows you to have multiple logins on just one
            : terminal. Screen is useful for users who telnet into a machine or are
            : connected via a dumb terminal, but want to use more than just one
            : login.
            : 
            : Install the screen package if you need a screen manager that can
            : support multiple logins on one terminal.

yum install screen

Total download size: 494 k
Installed size: 795 k

You can use screen sessions but typing the following command:

screen

screen -list

The following command can be used to detach from a screen session without closing it.
This will leave the current command running: