Library /sys$common/syshlp/latcp$help.hlb DEFINE, /KEY, Qualifiers, /TERMINATE  *Conan The Librarian (sorry for the slow response - running on an old VAX)

       /TERMINATE
       /NOTERMINATE

    Specifies whether the command string will be terminated
    (processed) when you press the function key. The default is
    /NOTERMINATE, which allows you to press other keys before the
    command string is processed. Pressing Return has the same effect
    as using /TERMINATE.

    The /NOTERMINATE qualifier allows you to create key definitions
    that insert text into command lines, after prompts, or into other
    text that you are typing.