Windows 2012: Switching between Server Core and GUI

REFERENCES:
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http://blogs.technet.com/b/puneetvig/archive/2012/10/16/switch-between-full-and-core-in-windows-server-2012-using-powershell-3-0.aspx
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http://www.howtogeek.com/111967/how-to-turn-the-gui-off-and-on-in-windows-server-2012/
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http://gallery.technet.microsoft.com/scriptcenter/Switch-between-Windows-9680265d
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http://www.sqlha.com/2012/05/14/switching-between-server-core-and-full-gui-with-windows-server-2012/
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http://social.technet.microsoft.com/Forums/windowsserver/en-US/c524e98c-35d3-41a3-8d99-f7b4ad789a0c/server-core-2012-gets-stuck-at-68-installing-serverguimgmtinfra-feature?forum=winserver8gen
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http://blog.thesysadmins.co.uk/server-2012-moving-between-gui-core-and-minimal-server-interface.html
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http://community.spiceworks.com/topic/365701-impossible-to-install-gui-on-server-core-2012-caveats
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http://forums.mydigitallife.info/threads/40304-How-To-Convert-Server-2012-Core-Installation-into-Full-GUI-Server-and-viceversa
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http://social.technet.microsoft.com/Forums/en-US/e7140053-9039-43b4-981c-cb8a4ec8cffd/windows-server-2012-installwindowsfeature-command-executing-extreamly-slow?forum=winserver8gen
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http://www.networksteve.com/forum/topic.php/windows_server_2012_Install-WindowsFeature_command_executing_ext/?TopicId=41169&Posts=4
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http://www.networksteve.com/forum/topic.php/windows_server_2012_Install-WindowsFeature_command_executing_ext/?TopicId=41169&Posts=4
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