running icl from command line

Guys, I know intel's compiler needs VS in order to work. I have VS2013 Pro installed.

I need to run icl (your compiler) from command line. 

I've tried to run it by simply going into directory and typing icl [pathTo]main.cpp but I'm getting error:

icl: error: #10114 Microsoft Visual C++ not found in the path.

How to pass path to visual studio to icl from the command line?

Thank you.