one-pointedness??

["chenxsi <chenxsi@...>" <chenxsi@...>]

Does one-pointedness simply means to choose a topic, allow all 
related thoughts to enter your mind, and excluding all unrelated 
thoughts?

"to hold onto a single thought or idea for a longer while, and to 
suppress any other thoughts associating and obtruding with force on 
the mind," does it mean to hold onto a fixed thought such as a mantra 
or image, and excluding all other thoughts, even thoughts that are 
related? I know its useless to focus upon a mantra or image without 
knowing the meaning, but i am quite confused as to what exactly 
does "one-pointedness" means.

-confused and drooling from my mouth