Figure 1. FLAG Format
FLAG controls the routing of output messages. The MSG option, which handles messages more comprehensively, is explained later in this section. The format of the FLAG option is given below.
Specify FLAG(I) to route all messages to the data set specified by the SYSOUT DD statement and only critical messages to the console. (This is the same as the MSG=SC PARM.)
Specify FLAG(U) to route critical messages only to both the data set specified by the SYSOUT DD statement and the console. (This is the same as the MSG=CB PARM.)
Specify NOFLAG to route critical messages only to the console, no messages to the data set specified by the SYSOUT DD statement. (This is the same as the MSG=CC PARM.)