The easiest way to swap between keymaps and thus temporarily set keys to different language by use of loadkeys command. If the loadkeys command is unavailable install kbd package:
# yum install kbd
As for an example the following linux command will temporarily change system's keymap to Slovak:
# loadkeys sk
Loading /lib/kbd/keymaps/xkb/sk.map.gz
To list all available keymaps on your CentOS system run:
# localectl list-keymaps

At the moment Skype.com does not provide and installation package for CentOS Linux. The closest package we can use to install Skype communicator on CentOS is is based on Fedora Linux. Navigate to http://www.skype.com/en/download-skype/skype-for-linux/ and download a Fedora i386 skype package. At the time of writing the package version is skype-4.3.0.37-fedora.i586.rpm. Once downloaded run the below yum command as a privileged user to install Skype on your CentOS linux system:
# yum localinstall skype-4.3.0.37-fedora.i586.rpm

The python version 3 is not available from CentOS 7 repositories. The following config will show you how to compile and install Python version 3 from source on CentOS 7 Linux. Let's start by installation of some required tools which you will need for this tutorial.
# yum install yum-utils make wget
Next, we will install all python build prerequisites to meet all compilation requirements:
# yum-builddep python

In order to install VirtualBox virtualization software on CentOS Linux first install prerequisites:
yum install kernel-devel gcc
Next, download relevant RPM package to your CentOS version from https://www.virtualbox.org/wiki/Linux_Downloads.

Once downloaded, navigate to directory where you have downloaded the VirtualBox RPM and execute check its signature eg.:
# rpm --import https://www.virtualbox.org/download/oracle_vbox.asc
# rpm --checksig VirtualBox-5.0-5.0.0_101573_el7-1.x86_64.rpm
If signature match use below command to install VirtualBox package while replacing package version number with the one you have downloaded previously:
yum localinstall VirtualBox-5.0-5.0.0_101573_el7-1.x86_64.rpm

The default installation of CentOS Linux 7 does not come with installation of adobe flash player for Firefox web browser and thus must be installed separately. To begin flash player installation first we need to include Adobe's repository. This can be achieved by the following linux command:
# yum -y install http://linuxdownload.adobe.com/linux/x86_64/adobe-release-x86_64-1.0-1.noarch.rpm
Confirm that Adobe repository has been included:
# yum repolist | grep -i adobe
adobe-linux-x86_64      Adobe Systems Incorporated                            2
At this stage we are ready to install adobe flash player using yum command:
# yum install flash-plugin

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