the netherworld is also called 'yin jian' in Chinese. It is a
place, that has 36 divisions all governed by 36 Lords of the Soil.
Hell, or rather the place for sufferings are within the
netherworld. The 10 courts also fall in the netherworld.
Other then that, the netherworld is a place for souls to residue,
those ghosts or those haven reincarnate yet.
the actions done in the 10 courts, has NO against the law of cause
and effect. In fact, it is a kind of 'Action After Review' done by
the divines (10 kings of Yama). A summary of what human had done.
No matter what we become, we will be 'brief' by the 10
courts.
The overall in charge of the 10 courts, are Lord Fengdu and Lord
Taishan of Dongyue. There is NO bribery or wat so ever rubbish in
hell, contary to superstious belief.
Those hell notes, offerings are an act to display filial peity from
the living and also thru rituals, it can ease some sufferings from
the soul and accumulate merits. It may sound funny that hell is so
'improvise'...using planes, handphones etc..whether or not they use
it is not impt, what impt is it can accumulate merits for the souls
and ease the sufferings comfort the spirits.
Thru rituals, it is a form of merits.