uscmd (USHORT)

      Command.

      SB_LINELEFT

        Sent if the operator clicks on the left arrow of the scroll bar, or depresses the VK_LEFT key.
      SB_LINERIGHT
        Sent if the operator clicks on the right arrow of the scroll bar, or depresses the VK_RIGHT key.
      SB_PAGELEFT
        Sent if the operator clicks on the area to the left of the slider, or depresses the VK_PAGELEFT key.
      SB_PAGERIGHT
        Sent if the operator clicks on the area to the right of the slider, or depresses the VK_PAGERIGHT key.
      SB_SLIDERPOSITION
        Sent to indicate the final position of the slider.
      SB_SLIDERTRACK
        If the operator moves the scroll bar slider with the pointer device, this is sent every time the slider position changes.
      SB_ENDSCROLL
        Sent when the operator has finished scrolling, but only if the operator has not been doing any absolute slider positioning.

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