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Poke Transaction
A client can send unsolicited data to a server by using DdeClientTransaction to send an XTYP_POKE transaction to a server's callback function.
The client application first creates a buffer that contains the data to send
to the server and then passes a pointer to the buffer as a parameter to DdeClientTransaction. Alternatively, the client can use the DdeCreateDataHandle function to obtain a data handle that identifies the data and then pass the
handle to DdeClientTransaction. In either case, the client also specifies the topic name, item name, and
data format when it calls DdeClientTransaction.
The DDEML passes the XTYP_POKE transaction to the server, specifying the topic
name, item name, and data format that the client requested. To accept the data
item and format, the server should return DDE_FACK. To reject the data, the
server should return DDE_FNOTPROCESSED. If the server is too busy to accept the
data, the server should return DDE_FBUSY.
When DdeClientTransaction returns, the client can use the lpdwResult parameter to access the transaction-status flag. If the flag is DDE_FBUSY,
the client should send the transaction again later.
If a server does not support the XTYP_POKE transaction, it should specify the CBF_FAIL_POKES filter flag in DdeInitialize. This flag prevents the DDEML from sending this transaction to the server.
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