IBM Computer Hardware User Manual page 46

Figure 31 Installing the private key ring file for the second HMC
Copy the public key ring file to removable media for installing the key file on
the client PC. Select System Manager Security → Certificate Authority,
and in the right panel, select Copy this Certificate Authority Public Key
Ring File to removable media. A dialog panel is displayed (see Figure 32 on
page 47).
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Hardware Management Console (HMC) Case Configuration Study for LPAR Management