My Mac book is not accepting my password

I have been using my Macbook all day, now suddenly when I was trying to load an app, it no longer accepts my password ! I've tried various approaches in case it was the keyboard malfunctioning but obviously can't tell, and the 'Name' is correct. It just doesn't recognize my password and now can't access my notebook. Is there any way that I can regain access ?

http://support.apple.com/kb/HT4798
Try not to forget the new one!

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