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{{Short description|A user accessing a system or resource at the same time as another}} In [[computer science]], the number of '''concurrent users''' (sometimes abbreviated CCU) for a resource in a location, with the location being a computing [[computer network|network]] or a single computer, refers to the total number of [[person|people]] simultaneously accessing or using the resource. The resource can, for example, be a [[computer program]], a [[Computer file|file]], or the computer as a whole.<ref name="HohmannBeyond03">{{cite book |url=https://books.google.com/books?id=0slJ8zynjCEC&pg=PA76 |title=Beyond Software Architecture: Creating and Sustaining Winning Solutions |author=Hohmann, L. |publisher=Addison-Wesley Professional |pages=76β8 |year=2003 |isbn=9780132465946}}</ref> Keeping track of concurrent users is important in several cases. First, some [[operating system]] models such as [[time-sharing]] operating systems allow several users to access a resource on the computer at the same time. As system performance may degrade due to the complexity of processing multiple jobs from multiple users at the same time, the capacity of such a system may be measured in terms of maximum concurrent users.<ref name="SharmaFoundation09">{{cite book |url=https://books.google.com/books?id=AjWh-o7eICMC&pg=PA10 |title=Foundation of Operating Systems |author=Sharma, D.P. |publisher=Excel Books |pages=10β11 |year=2008 |isbn=9788174466266}}</ref><ref name="ChauhanFunda06">{{cite book |url=https://books.google.com/books?id=NN6Hx8s3NjwC&pg=PA84 |title=Fundamentals of Computer |author1=Chauhan, S. |author2=Saxena, A. |author3=Gupta, K. |publisher=Firewall Media |page=84 |year=2006 |isbn=9788170088547}}</ref> Second, commercial software vendors often [[Software licensing|license a software product]] by means of a concurrent users restriction. This allows a fixed number of users access to the product at a given time and contrasts with an unlimited user license. For example: Company X buys software and pays for 20 concurrent users. However, there are 100 logins created at implementation. Only 20 of those 100 can be in the system at the same time,<ref name="HohmannBeyond03" /><ref name="PallattoStudy05">{{cite web |url=https://www.eweek.com/it-management/study-shows-enterprises-favor-concurrent-user-software-licenses |title=Study Shows Enterprises Favor Concurrent-User Software Licenses |author=Pallatto, J. |work=eWeek |publisher=QuinStreet, Inc |date=12 October 2005 |accessdate=2 March 2019}}</ref> this is known as [[floating licensing]]. Concurrent user licensing allows firms to purchase computer systems and software at a lower cost because the maximum number of concurrent users expected to use the system or software at any given time (those users all logged in together) is only a portion of the total system users employed at a company. The concurrent licenses are global and shared by anyone who needs to use the system. This contrasts with "[[Per-seat license|named-seats]]" licensing, in which one license must be purchased for each and every individual user, whether they are using the system or not.<ref name="PLIUnderstand06">{{cite book |title=Understanding the Intellectual Property License |author=Practising Law Institute |publisher=Practising Law Institute |pages=140β42 |year=2006}}</ref><ref name="SommerSAM13">{{cite web |url=http://omtco.eu/references/sam/top-200-sam-terms-a-glossary-of-software-asset-management-terms/ |title=Top 200 SAM Terms β A Glossary Of Software Asset Management Terms |author=Sommer, T. |publisher=OMTCO |date=May 2013 |accessdate=2 March 2019 |archive-date=10 August 2013 |archive-url=https://web.archive.org/web/20130810111112/http://omtco.eu/references/sam/top-200-sam-terms-a-glossary-of-software-asset-management-terms/ |url-status=dead }}</ref> If a company employs 400 system users in which 275 work during the day and 125 work at night, then they can opt to purchase only 275 concurrent user licenses since there will never be more than 275 users on the system during a normal work day. The night workers share 125 of the day users' licenses to use the system. For named-seat licenses, this same company would have to purchase 400 individual licenses, one for each user, and licenses would not be globally shared. The available options for licensing are entirely at the discretion of the vendor selling the product. ==See also== *[[Floating licensing]] ==References== {{reflist}} {{Concurrent computing}} {{DEFAULTSORT:Concurrent User}} [[Category:Computing terminology]]
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