Relational databases have been rationalized and implemented since the 1970s as the successor to traditional navigational based databases that computers originally used. Relational systems initially depended on content within the database rather than standard links. Within these relational systems would exist a key, or rather a piece of content that would exist across all tables within the database to string tables together. These relations would loop together when information is to be queried by a database navigator. This loop functions much like the tapes that Krapp uses to tap into his memories, rendering his collection a database, and his querying of information a search through tables or sound bytes to relay desired information.