DBCHCL If a request is currently active on the session specified by the session identifier fields of the DBCAREA: Function field of the MTDP control block is set to MTDPRET Session and request identifier fields of the MTDPCB are set to the active session and request identifiers Waitdata option is set according to the value of the DBCAREA waitdata option flag MTDP is called to wait for completion of the active request