procedure for changing passwords of OS and RDBMS

Hi All,

I'm having 2 Node MS failover cluster (windows 2008) with SAP PI (ABAP + JAVA) on Oracle RDBMS.

Cluster servers is executed by domain admin "sapcluster" and my "<sid>adm", "SAPService<SID>" are domain users.

I request you to guide with right procedure for changing all passwords.

for Domain admin, SAP OS users and RDBMS users.

will there be any order to be followed ?

Kind regards,

Harika