VMS Help PHONE, Qualifiers  *Conan The Librarian (sorry for the slow response - running on an old VAX)

1 - /SCROLL

       /SCROLL
       /NOSCROLL

    Determines how new lines of text are displayed on the screen
    when the viewport becomes full. If /NOSCROLL is specified, the
    text lines are wrapped and new text appears on the top line of
    the viewport. /NOSCROLL improves the response time for terminals
    operating at slow speeds.

    If /SCROLL is specified, the text is scrolled up one line each
    time a new line of text is entered. The new line appears at the
    bottom of the viewport. /SCROLL is the default.

2 - /SWITCH_HOOK

       /SWITCH_HOOK="character"

    Specifies the Phone Utility switch-hook character (%).  The
    switch-hook character must be entered before each Phone utility
    command that is entered during a conversation.

    PHONE commands are terminated by pressing RETURN or by entering
    the switch-hook character. Text typed without the switch-hook
    character is considered part of the conversation. You can use
    any nonalphanumeric character as the switch-hook character.
    Enclose the character in quotation marks. The default switch-hook
    character is the percent sign (%).

3 - /VIEWPORT_SIZE

       /VIEWPORT_SIZE=n

    Specifies the maximum number of lines in a viewport, including
    the heading line and the bottom line of dashes. The valid range
    is 3 to 10 lines. Smaller viewports will improve the response
    time on terminals operating at slow speeds. The default viewport
    size is automatically reduced as more participants enter the
    conversation.