A temporary dataset, starting with a prefix of &&* and followed by a number, is used when the DSN keyword does not exist in the JCL DD statement.
In this case, the %%$DDDSN variable shows this temporary value.
Figure JV28 CTJVER output with temporary dataset - Example 13
                4 //NDSNDEV  DD  DISP=(NEW,PASS),                               
                  //         DCB=(LRECL=0080,BLKSIZE=3120,RECFM=FB,DSORG=PS),   
                  //         SPACE=(TRK,(0001,0001),RLSE),                      
                  //         MGMTCLAS=TOTO                                      
CTJDSIW         4 WARNING: SPECIFIED MGMTCLAS TOTO does not exist. DSN=&&*00000001
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