in more characters. Windows Search apparently used up a lot of processing power, as Windows Desktop Search would only run if it was directly queried or while the PC was idle. Even only running while directly queried or while the computer was idled, indexing the entire hard drive still took hours. The index would be around 10% of the size of all the files that it indexed, e.g. if the indexed files amounted to around 100GB, the index size would be 10GB. With the release of Windows Vista came Windows Search 3.1. Unlike its predecessors WDS and Windows Search 3.0, 3.1 could search through both indexed and non indexed locations seamlessly. Also, the RAM and CPU requirements were greatly reduced, cutting back indexing times immensely. Windows Search 4.0 is currently running on all PCs with Windows 7 and up. Mac OS In 1994 the AppleSearch search engine was introduced, allowing users to fully search all documents within their Macintosh computer, including file format types, meta-data on those files, and content within the files. AppleSearch was a client/server application, and as such required a server separate from the main device in order to function. The biggest issue with AppleSearch were its large resource requirements: "AppleSearch requires at least a 68040 processor and 5MB of RAM." At the time, a Macintosh computer with these specifications was priced at approximately $1400; equivalent to $2050 in 2015. On top of this, the software itself cost an additional $1400 for a single license. In 1997, Sherlock was released alongside Mac OS 8.5. Sherlock (named after the famous fictional detective Sherlock Holmes) was integrated into Mac OS's file browser – Finder. Sherlock extended the desktop search function to the World Wide Web, allowing users to search both locally and externally. Adding additional functions—such as internet access—to Sherlock was relatively simple, as this was done through plugins written as plain text files. Sherlock was included in every release of Mac OS from Mac OS 8, before being deprecated and replaced by Spotlight and Dashboard in Mac OS X 10.4 Tiger. It was officially removed in Mac OS X 10.5 Leopard Spotlight was released in 2005 as part of Mac OS X 10.4 Tiger. It is a Selection-based search tool, which means the user invokes a query using only the mouse. Spotlight allows the user to search the Internet for more information about any keyword or phrase contained