are created or modified. If the system discovers that files on an external drive have been modified on a system running a version of macOS older than Mac OS X Tiger, it will re-index the volume from scratch. Within Tiger, Spotlight can be accessed from a number of places. Clicking on an icon in the top-right of the menu bar opens up a text field where a search query can be entered. Finder windows also have a text field in the top-right corner where a query can be entered, as do the standard load and save dialogue boxes. Both of these text fields immediately start listing results of the search as soon as the user starts typing in a search term, returning items that either match the term, or items that start with the term. The search results can be further refined by adding criteria in a Finder window such as "Created Today" or "Size Greater than 1 KB". Mac OS X Tiger and later also include command line utilities for querying or manipulating Spotlight. The mdimport command, as well as being used by the system itself to index information, can also be used by the user to import certain files that would otherwise be ignored or force files to be reimported. It is also designed to be used as a debugging tool for developers writing Importer plug-ins. mdfind allows the user to perform Spotlight queries from the command line, also allowing Spotlight queries to be included in things like shell scripts. mdls lists the indexed attributes for specific files, allowing the user to specify which files and/or which attributes. The indexes that Spotlight creates can be managed with mdutil, which can erase existing indexes causing them to be rebuilt if necessary or turn indexing off. These utilities are also available on Darwin. Although not widely advertised, Spotlight can perform boolean searches. By default if one includes more than one word, Spotlight performs the search as if an "AND" was included in between words. If one places a '|' between words, Spotlight performs an OR query. Placing a '-' before a word tells Spotlight to search for results that do not include that word (a NOT query). Currently Spotlight is unable to index and search NTFS volumes shared via SMB. Leopard With Mac OS X Leopard, Apple introduced some additional features. With Spotlight in Tiger, users can only search devices