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Activate a license by specifying the activation key, with the host ID hostid selected automatically from the current machine:
lacutil.exe -activate -act_key X34UT-0B2VE-1LAT9-Y3S45
Activate a license by specifying the activation key and a host ID hostid list:
lacutil.exe -activate -act_key X34UT-0B2VE-1LAT9-Y3S45 -hostid ETHERNET=DABA9F60077CBD89,BIOS=Y2DVL2
Print out a host ID hostid list for the current machine:
lacutil.exe -hostid