How to get base path

[eluser]Unknown[/eluser]
Is there are defined Codeigniter constant for getting the path where Codeigniter is installed in the operating system?

[eluser]John_Betong_002[/eluser]
http://ellislab.com/codeigniter/user-gui...names.html
 
 

[eluser]vhen[/eluser]
BASEPATH