TSO provides a line drop facility that enables a user to log on to TSO from another terminal and reconnect to the existing session by issuing the LOGON command with the RECONNECT operand.

During this logon to the new terminal, LOGON command processing requests that RACF® verify the user's user ID and password, password phrase, or operator identification card. Also, if the TERMINAL class is active, the user's authority to access the new terminal is checked. Note that the user cannot change connect groups when the RECONNECT operand is used.

If verified and authorized, the user can resume the interrupted session from the new terminal.