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GetScrollRange       Get Current Max. & Min Positions

void GetScrollRange(hWnd, nBar, lpMinPos, lpMaxPos)
HWND hWnd;
int nBar; /* See below */
LPINT lpMinPos;
LPINT lpMaxPos;


                nBar
        |----------------------------------------------------|
        | SB_CTL   hWnd is scroll bar control                |
        | SB_HORZ  hWnd is window with horizontal scroll bar |
        | SB_VERT  hWnd is window with vertical scroll bar   |
        +----------------------------------------------------+

Returns:    Min and Max positions in lpMinPos and lpMaxPos.