
append exclude:ID to your URL query string to exclude a category from the listing. e.g. ?x=cat:10;exclude:5 to list all the entries which belongs to cat-id 10 AND NOT to cat-id 5
append exclude:ID to your URL query string to exclude a category from the listing. e.g. ?x=cat:10;exclude:5 to list all the entries which belongs to cat-id 10 AND NOT to cat-id 5