"ExitSubsession"

"ExitSubsession" is a front end token that ends an interactive session in the specified kernel.

This token is equivalent to the menu command Kernel Evaluation Exit Subsession.

This token requires a parameter, which can be the name of the kernel (evaluator) or Automatic if you want the default kernel.

To execute a front end token, you typically evaluate a command of the form FrontEndExecute[FrontEndToken[token]].