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The only purpose of using these flags is to speed up the connection by ensuring that the first connection succeeds. For example, if you know an integrated Logon will be the only connection you want to succeed, specify DBCF=CT_INTEGRATED_LOGON:Y and DBCF= CT_AUTHENTICATION_ERROR_IS_FATAL:Y. This will cause the first connection to be integrated and a fatal error will occur if that connection is unsuccessful.
Other DBCF Flags
CT_AUTHENTICATION_ERROR_IS_FATAL: An authentication error by default is not fatal. Setting this option on ensures that the first connection will either succeed or there will be a fatal error. This is similar behavior to LANSA Version 11.3.
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CT_ALL_FLAGS_ON: Sets all the flags on or off. Typically used to ensure that any preceding commands are neutralized by using DBCF=CT_ALL_FLAGS_ON:N. It does not make sense to use DBCF=CT_ALL_FLAGS_ON:Y, although all flags will be set on if it is used.