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

    VT100: EXT + B              VT200: F13
    DEFINE_KEY Function: HOME

    Repositions the cursor to the first position in the first
    unprotected field on the screen (that is, to the beginning of
    the input area on the screen).