(S)DSNLOAD library contains load modules for DB2 product such as DB2 Utilities , DB2 internal systems .
For example , DSNUTILB ( IBM DB2 Utility Program ) load module is available in DSNLOAD library and this library is usually coded in STEPLIB . It is APF authorized library .
(S)DSNEXIT conatins less load modules which are required for subsystem startup . Expecially it conatins loadmodule of DSN Zparms ( DB2 internal system Parameters) . This is library is usually added to Linlkist library . So no need to add this library in Steplib or JCLlib .