In computer science, the number of concurrent users for a resource in a location, with the location being a computing network or a single computer, refers to the total number of people using the resource within a predefined period of time. The resource can, for example, be a computer program, a file, or the computer as a whole.
A computer operating system that allows several users to access a resource on the computer at the same time is a multiuser multitasking operating system, historically called a time-sharing operating system. The capacity of a system can also be measured in terms of maximum concurrent users, at which point system performance begins to degrade noticeably.
Commercial vendors often 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 is in contrast 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. 
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 "named-seats" licensing, in which one license must be purchased for each and every individual user, whether they are using the system or not.
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.
- Study shows enterprises favor concurrent-user software licenses, www.eweek.com, 12 October 2005 (accessed 20 January 2007)