In the first mode, the sending application chooses the default application as the allowable destination. This mode is the programmatic equivalent of the user sending a file by interactively using the default file transfer application.
To select this mode, the sending application does not specify the XF_MATCHID option in the xfSend or xfConnectAndSend function call. The sending application does use a connection made (with an xfConnect function call for the xfSend function, or as part of the xfConnectAndSend function call) with an XFRADDRESS structure that specifies a NULL in the uuidAppID field. With this combination of parameters, the default application receives the file transfer.