This function scrolls the contents of a window rectangle.

#define INCL_WINWINDOWMGR /* Or use INCL_WIN, INCL_PM, Also in COMMON section */
#include <os2.h>

HWND      hwnd;           /*  Window handle. */
LONG      lDx;            /*  Amount of horizontal scroll to the right (in device units). */
LONG      lDy;            /*  Amount of vertical scroll upward (in device units). */
PRECTL    prclScroll;     /*  Scroll rectangle. */
PRECTL    prclClip;       /*  Clip rectangle. */
HRGN      hrgnUpdateRgn;  /*  Update region. */
PRECTL    prclUpdate;     /*  Update rectangle. */
ULONG     flOptions;      /*  Scroll options. */
LONG      lComplexity;    /*  Complexity of resulting region/error indicator. */

lComplexity = WinScrollWindow(hwnd, lDx, lDy,
                prclScroll, prclClip, hrgnUpdateRgn,
                prclUpdate, flOptions);