Difference/Dependency of RZ21 and DSW

Please let me know whats the diffrence in configuring CCMS alerts in RZ21 (CEN- SOL) and configuring CCMS in(CEN- SOL) Solution Manager -> DSWP -> Solution Monitoring ?? is Solman-> Solution Monitoring a shortcu way or a WIZARD way to RZ21 (creating CCMSUSR, CCMSREG .. etc what ever we do in RZ21) or we need to configure RZ21 as prerequisite to configure solution monitorind in DSWP