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log off to go through the steps required to exit a computer, database, or system. Logging off ends one's access to the system until one logs in again with user name and password.
look-up in computing, the capacity to search for and locate information in an electronic database. [1/2 definitions]
query in computing, a request for information submitted to a search engine or database using a computer language or human language [2/8 definitions]
search engine a software program that searches a database or network, esp. the Internet, for data, files, or documents containing terms specified by the user.