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# View Source Introduction

## Scope

The Erlang Runtime System Application, ERTS, contains functionality necessary to run the Erlang system.

> #### Note

> By default, `ERTS` is only guaranteed to be compatible with other Erlang/OTP components from the same release as `ERTS` itself.

> For information on how to communicate with Erlang/OTP components from earlier releases, see the documentation of system flag `+R` in erl.

## Prerequisites

It is assumed that the reader is familiar with the Erlang programming language.

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