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What does it mean that China Merchants Securities received two accounts by SMS after opening an account?

After China Merchants Securities opened an account, it received two account numbers by SMS, generally the capital account number and the shareholder account number. The fund account number is used to log in trading software and buy and sell stocks. There are two shareholder accounts, one for the Shanghai Stock Exchange and the other for the Shenzhen Stock Exchange, which means that you can buy and sell stocks of these two exchanges. It may also be another account I told you about, a one-code account, which is not used at ordinary times. This is the account used by Deng Zhong Company to manage your stock account.