What does REL mean on installing VS 2013? - visual-studio-2013

When I installed Visual Studio 2013 Ultimate, it gave me version "Visual Studio 2013 (12.0.21005.1 REL)".
What is meaning of REL?
Thanks.

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How to downgrade visual studio 2017 to 2015

I uninstalled visual studio 2015 to make way for 2017 but 2017 is not supporting xamarin.winphone so I would like to downgrade it to visual studio 2015 so that it supports xamarin winphone
I tried to find options to downgrade but I couldn't find any
My question is partly in relation with my earlier question
Thanks
Visual Studio 2015 can co-exist with visual Studio 2017. Since you have install Visual Studio 2015, and just start it from
"C:\Program Files (x86)\Microsoft Visual Studio 14.0\Common7\IDE\devenv.exe"
Sure, create shortcut on your desktop for your next time......

Visual Studio 2010 Express compatible with Community 2015?

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Visual Studio 2010 disappears after installing Visual Studio 2013

First I have installed Visual Studio 2013 Professional, then I installed Visual Studio 2010 Ultimate.
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In Visual Studio 2013 - No problem.
But in Visual Studio 2010 - Visual Studio 2010 disappears.
The older version must be installed first, since the installation does not downgrade.
First install the 2010 version and then to 2013.

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re installing xamarin
.devnev.exe/setup
.re installing visual studio.
From the source - upgrade to VS2012 - https://developer.xamarin.com/guides/cross-platform/getting_started/requirements/
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installing visual studio 2013 ultimate beside visual studio 2010 ultimate

i have installed visual studio 2010 ultimate edition for some years.
My operating system is windows 7 x64 sp1.
I want to install (visual studio 2013 ultimate edition + Update1) beside visual studio 2010
ultimate edition. I found some links about conflict between vs2010 and vs2012 but they did not
mentioned about conflict between vs2010 and vs2013.
please help if you found any conflicts.
Thanks alot.

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