Thanks. A stupid question, but what do all the numbers actually mean and do?
The numbers are "slots" in wich code/ ios content can be installed.
ios 236 is a custom slot containing a patched ios36, renabling a bug, giving it permission to install stuff on your wii's NAND. ( simply said )
nowadays homebrew is able to add additional slots to your system ( all 200 and up ) , enabling to install custom content in those slots, wich various homebrew can revert to by loading these slots.
Your whole Wii loading sytem is structured this way somewhat.
A game calls for a slot number, Wii loads the instructionset that is in that slot. etc.
Same for homebrew, but can also load cutom slots containing homebrew code ( Cios )
236 is somwhat the standard cios/slot to use when you need acces/control to your wii's filesystem in this point of time.
It's part of the first steps after the HBC/ bootmii install, enabling installment of other cios, patching ios 36 but without modifying the original ios by installing it a custom made slot, 236.
Earlier ios36 was patched somewhat altering the original wii system, HBC and other apps can shown problems when this was the case.
homebrew and piracy do not go hand in hand.
ios 236 is very important in that regard.