> For the complete documentation index, see [llms.txt](https://support.tiger.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://support.tiger.com/english/frequently-asked-questions/how-does-automatic-account-selection-work.md).

# How does automatic account selection work?

In the **Basic settings → Trading** section, you can specify how the account will be selected in the trading toolbar. If you have enabled the auto-substitution mode, then the account will be inserted automatically into the open **Chart** and **DOM** trading toolbars when connecting to a crypto exchange or terminal. 

![](https://s3-eu-central-1.amazonaws.com/euc-cdn.freshdesk.com/data/helpdesk/attachments/production/80109614468/original/YXAlDF8jK-B4z1K0_Cserh1RM8GGCCzOLQ.gif?1654112099)

Let’s take a look at 3 cases:

1\. If you have **one connection of the same type** (only one Bitfinex or one QUIK, or only one Binance, etc.), then the account will be substituted for the specified connection regardless of the auto-connection status (this is typical for [crypto exchanges](/english/settings/connections/crypto-exchanges.md)). 

![](https://s3-eu-central-1.amazonaws.com/euc-cdn.freshdesk.com/data/helpdesk/attachments/production/80109614849/original/_9J11_Cx0xxOlCoT_EOEdbxnJ0I-zLq3kQ.png?1654112300)

2\. If you have **multiple connections of different types** (e.g., Binance and QUIK), account substitution will only occur in the trading toolbars of the corresponding instruments.

3\. If you have **several connections of the same type** (e.g., 2 crypto exchanges or 2 terminals), then:

* 2 crypto exchanges, both with auto-connection (there are checkmarks in the “Auto-connect” column) — the account will not be substituted.
* 2 crypto exchanges, one of which has auto-connection — its account number will be substituted in the trading toolbars.
* 2 terminals — the account will not be substituted.


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