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

    You cannot redefine the following DIGITAL-reserved keys:

    o  Ctrl/Y - Interrupt

    o  Ctrl/C - Cancel/interrupt

    o  Ctrl/O - Output off/on

    o  Ctrl/S - Suspend output

    o  Ctrl/Q - Resume output

    o  F1-F5