MAC

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   .-MAC--=--NONE-----.   
>>-+------------------+----------------------------------------><
   |         .-NONE-. |   
   '-MAC--=--+------+-'   
             +-COND-+     
             '-REQD-'     

Specifies the level of message authentication support required for this application program.
MAC=COND
Specifies that the application is capable of engaging in message supported sessions, and that MACing is required if the session partner is MAC capable.
MAC=NONE
Specifies that this application program is not capable of engaging in message authentication supported sessions.
MAC=REQD
Specifies that VTAM® must use a message authentication code on all messages to and from this application program.
Note: A mandatory message authentication support and cryptographic enhancements session is established only under the following conditions: