What is Itself ?
Itself is pron 1. referring to an object The dog seems to have hurt itself. The screw had worked itself loose. all by itself alone, with no one helping The church stands all by itself in the middle of the street. The bus started to move all by itself. 2. for emphasis If the plug is all right there must be something wrong with the computer itself.
source: Easier English, Student Dictionary Upper Intermediate Level