why and how the view is putted in the sidebar first block I am studying the distrbution OpenAID 
http://drupal.org/project/openaid
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I have a question:
in the block : sidebar first. there are some special view related with the url.

but in admin/struction/block. the sidebar first is none.

so question: why and how the view is putted in the sidebar first.

I get a clue : Exposed form , but more confuse is left.
resolved it 
use context module.
Conditions select view
Reactions select block - sidebar first