Knowing when a password is interpreted as case sensitive or not can directly affect how you use a local operating system registry. WebSphere® Application Server exploits the mixed case password option for the Resource Access Control Facility (RACF®) and allows you to use case sensitive passwords.
If you use a Lightweight Directory Access Protocol (LDAP) configuration, you can use mixed case passwords.
For more information on the mixed case password feature in z/OS Version 1.7, see Z/OS V1R7.0 Security Server RACF Security Administrator's Guide. This guide is available under "Security Server and Integrated Security Services. Within the guide, see section 5.2.1.