Omitting a userid and password
If the installation has enabled unified login with the ARS.PTGN dynamic exit and you omit the parameters specifying a userid and password, you may not be prompted for a userid and password. Instead, your userid (as returned by UNIX System Services) will be used to log on to Content Manager OnDemand. If that userid cannot be used, you will then be prompted for a userid and password.
For information about enabling unified login and the ARS.PTGN dynamic exit, see IBM® Content Manager OnDemand for z/OS®: Configuration Guide.