The non-public essential database named Lustrator (the Screener) serves to obtain initial information related to processing applications and disclosing documents to the public. It has been created on the basis of computerised database Evidencia záujmových osôb (EZO) (Record of Persons of Interest) created by the Federal Ministry of Interior in 1980s, databases created by the ÚPN employees or according to databases obtained from other institutions.