Help in JAVA JSF compnents

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Java

Hie guys
I am prety new to JSF and Iam working on some peice of code. I am using primefaces components and JSF backed beans.
Here are a list of my questions;
1. Is there a way of running a method each time a page loads.
2. During page load how do I check that the page resulted from an initial request or its a postback.
3. i there a way to dynamically change component's properties such as enabled/disabled, change the label of the text or hidding it without using javascript

Your Help will be greatly appreciated.

Yours

George Tsiga (Student)