XTYP_ADVSTOP 
 A dynamic data exchange (DDE) server callback function receives the XTYP_ADVSTOP transaction when a client specifies XTYP_ADVSTOP in the DdeClientTransaction function. A client uses this transaction to end an advise loop with a server.
This transaction is filtered if the server application specified the CBF_FAIL_ADVISES flag in the DdeInitialize function.
  Windows NT: Requires version 3.1 or later.
  Windows: Requires Windows 95 or later.
  Windows CE: Unsupported.
  Header: Declared in ddeml.h.
Dynamic Data Exchange Management Library Overview, Dynamic Data Exchange Management Transactions, DdeClientTransaction, DdeInitialize, DdePostAdvise