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ScrollDC             Scroll Rectangle

BOOL ScrollDC(hDC, dx, dy, lprcScroll, lprcClip, hrgnUpdate, lprcUpdate)
HDC hDC;
int dx; /* Horizontal scroll units */
int dy; /* Vertical scroll units */
LPRECT lprcScroll; /* Rectangle to scroll */
LPRECT lprcClip; /* Scroll area within both rectangles */
HRGN hrgnUpdate; /* NULL or handle to scroll region to be uncovered */
LPRECT lprcUpdate; /* Rectangle that must be updated after scroll */

Returns:    Non-zero if ok otherwise zero.