I think this is the first time I seen the !KING one. I'll have to look into it once I have time.
8 days ago I wrote a post about the KING command that may be helpful for you to understand how the command works ;)
https://ecency.com/hive-167922/@libertycrypto27/new-king-command-my-hashking-harvest-profit-calculation-buds-and-hkwater-market-values-eng-ita
!PGM
!PIZZA
!LOL
!BEER