One of the features available in CA TPX is that it can administer access control (it can provide password verification).
In addition to interfacing with RACF, CA ACF2 and CA Top Secret, CA TPX has its own built-in security.
This may or may not be used. It is at the discretion of the customer/client. This feature allows for mixing security with other security packages. You can have RACF, CA ACF2 or CA Top Secret in SMRT, and have a USER with SECURITY=TPX as an override.
CA TPX security can be administered at two levels or in combination with other security packages: