Use the RESPTOKEN keyword to specify a token that represents the client request to which the response is being sent. XCF uses the token to determine where the response needs to be sent. When the server exit routine is presented with the client request, the server exit parameter list contains a message descriptor (SXPLRQ_MsgDesc) that provides information about the client request. The message descriptor is mapped by ixcysrvr_tMsgDescriptor, which is declared in the IXCYSRVR mapping macro. Within the message descriptor, the field md_RespToken contains the token to be used for the RESPTOKEN keyword when invoking IXCSEND to send the response.

Note that md_RespToken is valid for use only if the client requests that the server is to send a reply. The md_ExpectReply field indicates whether the client specified EXPECTREPLY=YES to request a response. If the client expects a response, completion of the client request will remain pending until a response or acknowledgment is received. In particular, failure to send a response could cause the client to remain blocked in IXCRECV processing until the RESPTIME timeout value of the client request expires.