How to know the version

[eluser]Unknown[/eluser]
Sorry form my bad english but i must know the actual version of my codeIgniter, how i can do it?
Thanks

[eluser]WanWizard[/eluser]

Code:

echo CI_VERSION;

[eluser]John_Betong_002[/eluser]
Is the Reactor CI_VERSION always 2.0.2 and does it have a build version such as CI_BUILD?