privateKeyFile usage

I noticed the "privateKeyFile" variable in the Remote Command operation in OO.

I see that it is a "path to private key file, relative to ICONCLUDE_HOME"

 

I'm assuming I can put a file where ever that location is.
Do I put my dsa/rsa private key in that file so I can access my host without requiring a password?

 

Does anyone know where I can find documentation on this, and other pre-defined variables, besides in the OO tool itself?

 

 

Thanks,

Total Newbie