[Q] external SD on Froyo 2.2 and wallpaper

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well i got 2 questions ..
is there any way to see how Froyo decide wich apps/games could be moved to external SD card and wich not?
Since i would like to throw all apps on external SD..
i serch the WWW and ppl said that core apps you cannot move, but the rest you shuld be abel to move to external SD card.


and second .. well .. i just realize that when i enter settings my background is going black. Maybe since before i was having mostly black background and didint notice, so is that like normal or i ****ed up in some settings?

i made mistake .. when i said settings window i mean application window background ..
so can anyone just say when they enter application from home screen does they background goes black or not?
thx