HELPLIB.HLB  —  PHONE  Qualifiers  /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.
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