Me and my friends are using the same account for trading. However, one of our friends want to set up a limit for sell. For example, I want remotely to set up limit for operations. For example block person not to buy or sell anything for more than $50. Also, for example if my friend has lost $50, then that is it. He is blocked.
Is it technically possible?
I don't believe that is directly possible if all of you are using a single shared account!
With so many brokers offering accounts with no minimum limit for the balance, I don't understand your need to have a single shared account!
My suggestion - create separate accounts and save yourselves all that hassle.