Pine has a function key mode which is enabled by the USE-
    FUNCTION-KEYS option in the pine resource file. When enabled,
    the VT numeric keypad keys are mapped to the function keys F1
    through F12 as follows:

    o  PF1-PF4 are mapped to F1-F4,

    o  KP5-KP9 are mapped to F5-F9,

    o  KP0 is mapped to F10,

    o  KP1 is mapped to F11, and

    o  KP2 is mapped to F12.

    In addition, the top row function keys F6 to F12 are mapped to
    their namesakes. The HELP key is mapped to F1.

    The MINUS key on the numeric keypad, KP-, can be used in place
    of the control, CTRL, key. However, it is used as a two key
    sequence. For example, to enter CTRL/A, you would press the two
    keys KP- followed by A.

    One consequence of using pine in function key mode is that you
    can only choose from twelve commands at any given time. That
    is, whereas in alphabetic key mode you can press a key for a
    command even though the command is not visible on the bottom of
    the screen, in function key mode you must toggle to the screen
    where the command is visible.