Hendry,

Here it is
http://msdn.microsoft.com/library/default.asp?url=/library/en-us/winui/winui/windowsuserinterface/dataexchange/clipboard/clipboardreference/clipboardfunctions/setclipboardviewer.asp

DECLARE INTEGER SetClipboardViewer IN user32 INTEGER hWndNewViewer

The hWndNewViewer is a handle to the window to be added to the clipboard chain. Use HWnd from the _screen or from a form.