[JAWS-Users] notification chevron button

[anna vimini]

I have been using windows 8.1 for a while and I still do not know what 
the notification chevron button is used for.
could some one please tell me what it is used for and how would I go 
about using it?
because every time I try to use it I get no where. I know to get to it 
you press windows key and the letter b and then you activate it by 
pressing the space bar and then move the arrow keys to select what you 
want   but what do you do next?
thanks in advance
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