Difference between wmode and HW acceleration Level 1/2 ?

hi wondering difference between following 2:

 

1)  'hardware acceleration' (under publish settings), has following options: none, level 1 - direct, level 2 - gpu.

 

and

 

2) 'window mode' ( under html wrapper): window, opaque windowless, transparent windowless, direct.

 

 

what particularly confusing hardware acceleration 'direct', vs wmode 'direct' .

 

i know stage3d work have set wmode direct, 'hardware acceleration' level -1 direct then?

 

it seemed have absolutely no effect??

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