Documented [here](https://interactivebrokers.github.io/tws-api/classIBApi_1_1EClient.html#aa6ff6f6455c551bef9d66c34d1c8586c) * [encoding reference](https://github.com/InteractiveBrokers/tws-api/blob/817a905d52299028ac5af08581c8ffde7644cea9/source/csharpclient/client/EClient.cs#L728) * [decoding reference](https://github.com/InteractiveBrokers/tws-api/blob/817a905d52299028ac5af08581c8ffde7644cea9/source/csharpclient/client/EDecoder.cs#L417)
Documented here