hwndClient (HWND) - input
hwndServer (HWND) - input
If a server application is responding for more than one topic, it must use a different window for each topic.
pszAppName (PSZ) - input
This is the name of the responding server application. It must not be a zero-length string or null.
Application names may not contain slashes or backslashes.
pszTopicName (PSZ) - input
This is the name of the topic which the server is willing to support. It must not be a zero-length string or null.
pContext (PCONVCONTEXT) - input
mresReply (MRESULT) - returns