VMS Help TCPIP Services, TELNET, TN3270 Keyboard Functions, New Line  *Conan The Librarian (sorry for the slow response - running on an old VAX)

    VT100: Return               VT200: Return
    DEFINE_KEY Function: NEWLINE

    Moves the cursor to the first unprotected position on the next
    line of your screen. If no unprotected fields are on the screen
    when you invoke the new line function, the cursor moves to the
    first location on the screen. If the screen has no fields,
    this key has the same function as the Return key on DIGITAL
    terminals.