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At times I come across at this form of using should:

Should we wish to cancel these semantic actions—sometimes termed the default actions—of the event, we simply return the value false from the event handler.

It always starts with ‘should’. I understand it as ‘If we want to…’. I couldn’t find definition in my grammar book.

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Your understanding is correct...this use is called "subjunctive".

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OK, I get it! ‘With should, the speaker fells that the possibility is smaller’. Thank you, Chris! –  humbledude Feb 2 '11 at 20:49
    
Well, it's more just a matter that the speaker is speaking speculatively - about something that hasn't (or hadn't) happened, but might. –  Chris B. Behrens Feb 2 '11 at 20:53

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