MT4/MT5 allows you to manage multiple trading accounts. However, each session can only be logged in to one account at a time. When you switch between accounts, the current account will automatically log out, and the new account will log in.

Alternatively, you can install multiple instances of the MT4/MT5 to manage different accounts simultaneously. Additionally, it is possible to log in to the same account using the same credentials on different computers at the same time.