Multiple brain search
I like to design different brains with specific scopes. If I run the search it is at first limited on one brain. With an Pushbutton I can switch this to an extended search over all attached brains (linked brains, with copied thoughts) get now included in the extended search (over tags, categories, link-types, file-types, notes, etc.pp.).
Bill McLachlan commented
interesting, I was just about to request this. Whether right or wrong, I maintain 6 different brains that have no relation to each other and I thought that it would be interesting that while you're in one brain and a thought comes to you that you should check on something the input field would be available to simply search cost brains. That could also help to avoid possible duplications.