The given value can be overridden by setting an environment variable, MSG_PARAM (where PARAM is the tuning parameter name in upper case), at run time.
If VALUE is set to 0, no wrapping will occur. If it is set greater than 0, it specifies the maximum output line length.
2. The tuning parameters for MSG and ERR operate partially at the EMS level and may conflict in their requirements of EMS.
3. The use of SZOUT and STREAM may be affected by the message delivery system in use. For example there may be a limit on the the size of a line output by a Fortran WRITE and automatic line wrapping may occur. In particular, a NULL character will terminate a message delivered by the ADAM message system.
MERS (MSG and ERR) Message and Error Reporting Systems