# Server supported gaming

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**Server supported gaming** (SSG) is a method employed by video lotteries and casinos to operate [Video Lottery Terminals (VLTs)](/source/Video_Lottery_Terminal) and Electronic Gaming Machines (EGMs, commonly referred to as [slot machines](/source/Slot_machine)). An SSG system includes a central system and gaming terminals which connect to the central system. SSG systems may be operated locally over a [LAN](/source/Local_area_network) or span large geographical areas, even entire nations, over a [WAN](/source/Wide_area_network), such as the Internet.

SSG is often mistakenly referred to as [Server Based Gaming (SBG)](/source/Server_based_gaming), both examples of [server centric gaming](/source/Server_centric_gaming). A key difference is that in SSG systems, each game terminal has to contain a [Random Number Generator (RNG)](/source/Random_number_generation) and complete local copies of the games, whereas [SBG](/source/Server_based_gaming) systems centralize both the [RNG](/source/Random_number_generation) and game logic. In SSG systems, the server support is limited to analysis, content distribution and management, while [SBG](/source/Server_based_gaming) systems utilize the server for the actual gameplay and multiple other features as well.[citation needed]

## Certification and legality

Gaming Laboratories International has created a standard (GLI #21)[1] which includes requirements and definitions for Server Centric Gaming systems, referred to as Client-Server Systems (CSS).[2] GLI differentiates between Server Based Gaming Systems (SBGS) and Server Supported Gaming Systems (SSGS). GLI defines SBGS as “The combination of a server and client terminals in which the entire or integral portion of game content resides on the server.”[2] SSGS is defined as “The combination of a server and client terminal(s) which together allow the transfer of the entire control program and game content to the client terminal(s)…”[2] GLI certifies [SBG](/source/Server_based_gaming) and SSG systems according to the GLI #21 standard, something which is a requirement by many operators and [jurisdictions](/source/Jurisdiction) for them to consider and allow such systems.[citation needed]

## References

1. ["GLI-21: Client-Server Systems"](http://www.gaminglabs.com/downloads/GLI%20Standards/GLI-21%20v2.1.pdf). Gaming Laboratories International. Retrieved June 4, 2018.

1. ["GLI-21: Client-Server Systems"](http://www.gaminglabs.com/downloads/GLI%20Standards/GLI-21%20v2.1.pdf). Gaming Laboratories International. p. 10. Retrieved June 4, 2018.

## See also

- [Server Based Gaming](/source/Server_Based_Gaming)
- [Server centric gaming](/source/Server_centric_gaming)
- [Video lottery terminals](/source/Video_lottery_terminals)
- [Slot machine](/source/Slot_machine)
- [Casino game](/source/Casino_game)

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Adapted from the Wikipedia article [Server supported gaming](https://en.wikipedia.org/wiki/Server_supported_gaming) by Wikipedia contributors ([contributor history](https://en.wikipedia.org/wiki/Server_supported_gaming?action=history)). Available under [Creative Commons Attribution-ShareAlike 4.0 International](https://creativecommons.org/licenses/by-sa/4.0/). Changes may have been made.