Ddname specification - Key = '0001'
DUNDDNAM specifies the ddname of the resource to be deallocated. When you code this key, # must be one, LEN is the length of the ddname, up to a maximum of 8, and PARM contains the ddname.
Example: To specify the ddname DD1, code:
KEY # LEN PARM
0001 0001 0003 C4 C4 F1