Re: wp-bb, is it possible to define conditional tags for bbpress?
&& and || are just two different things. && means both things have to be true for the entire result to be true, || means just one needs to be true for the entire result to be true.
On a german keyboard I think it’s the capital letter on button just left of backspace. On a spanish layout it should be the one two left of enter, the one that also gives you ^ and [ (if I’m looking at the diagrams right). 
