This function compares two rectangles for equality.

#define INCL_WINRECTANGLES /* Or use INCL_WIN, INCL_PM, */
#include <os2.h>

HAB       hab;    /*  Anchor-block handle. */
PRECTL    prcl1;  /*  First rectangle. */
PRECTL    prcl2;  /*  Second rectangle. */
BOOL      rc;     /*  Equality indicator. */

rc = WinEqualRect(hab, prcl1, prcl2);