Editing OpenSimulator Internals/ROBUST Services (section)

== Must Stay in Same Instance ==

These services share state and have dependencies on each other. Running them in separate instances will cause data conflicts.

{| class="wikitable"
! Service !! Notes
|-
| [[OpenSimulator Internals/PresenceService|PresenceService]] || Who is online, which region, current session. Maintains a cache. Multiple instances would give conflicting answers.
|-
| [[OpenSimulator Internals/UserAgentService|UserAgentService]] || Manages the user agent when traveling via HyperGrid. Handles trust verification between grids.
|-
| [[OpenSimulator Internals/AgentPreferencesService|AgentPreferencesService]] || Per-user preferences such as hover height and language setting.
|-
| [[OpenSimulator Internals/GridUserService|GridUserService]] || Home region, last login location, online status. Must update atomically with PresenceService on login and logout.
|}

----