The MSGFILE runtime option is ignored under CICS®, because messages for a run unit are directed instead to the CICS transient data queue named CESE.
Messages are prefixed by a terminal ID, a transaction ID, a date, and a timestamp before their transmission. Figure 1 illustrates this format.
The entire message record is preceded by an ASCII control character to determine the format of the printing.
Message records are V-format.
See Using and handling messages for a complete description of Language Environment message handling.