This function sets the current clipboard-viewer window to a specified window.

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

HAB     hab;                /*  Anchor-block handle. */
HWND    hwndNewClipViewer;  /*  Window handle of the new clipboard viewer. */
BOOL    rc;                 /*  Success indicator. */

rc = WinSetClipbrdViewer(hab, hwndNewClipViewer);