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A CoreScript is a Lua script with level 4 security context (what functions they have access to) that does several "core" functions. They are currently only found within the ScriptContext and CoreGui services.

An example of a "core function" is the "core GUI", the gui at the top of your  screen. The scripts run the backpack, escape menu, built in-plugins such as the Avatar Importer, purchase prompts, and localization.

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