By including '!' at the start of your entry, you can search text fields for different files. For example, if you enter '!Meier' for a company name, the system finds all files that are unequal to 'Meier'.
If you work with wildcards, these are also used when searching for unequal fields. For example, if you enter '!tree', all hits that contain 'pear tree', 'tree trunk' or 'tree' are excluded.