Personal Communications Response

Personal Communications receives the Start Keystroke Intercept and returns an ACK message if it can start the intercept. Otherwise a negative ACK message is returned to the client with one of the following return codes in the low-order byte of the wStatus field:
WM_DDE_ACK(wStatus, aKEYS)
Return Code Explanation
1 Keystroke Intercept is already started.
6 The specified format is not valid.
9 A system error occurred.
Once the intercept has started, the client receives DATA messages notifying it that the keystroke is intercepted:
WM_DDE_DATA(hData, aKEYS)

The DATA messages continue until a Stop Keystroke Intercept message is sent to Personal Communications. The format of the data item is the same format as if the client requested the data item via a DDE_REQUEST.