What is the reason why VTAM applid is required?

Document ID : KB000094829
Last Modified Date : 04/05/2018
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Question:
Receive message: MFA00568 CA PAM ACB open failed
What is the reason why VTAM applid is required? 
Answer:
VTAM applid is needed if using PIV/CAC smart card readers.
CA-AAM requires a VTAM ACB (MAAINT00) to be able to issue VTAM SENDCMD/RCVCMD commands (such as: D NET,ID=luname command), in order to determine which PAM IP address the user came from; so that PAM Smart Card validation can take place for the Top Secret user.