The escape key commands are short-cuts to popular tasks.
ESC (invokes the serial CLI connection. This is not necessary for SSH or telnet sessions because they automatically start a CLI session after a successful login.
ESC Qstops the CLI session and terminates the SSH and telnet connection.
ESC R ESC r ESC Rresets the system.
ESC ^powers on the system.
ESC ESCerases the current line.
There is a one second timeout for entering any of the escape sequence characters.