Suppose I have a linux administration related question, having in mind some specific Debian box.
This, of course, could be done with a Google query like
[my query] AND ( site:askubuntu.com OR \ site:serverfault.com OR \ site:unix.stackexchange.com )
But I am probably missing some way to set some nice check boxes on the main stackexchange.com site -- sth like a missing "advanced query" link near the "search all sites" box, am I not? Ж:-)
PS. Two related questions: