If you find something like ZO_Tradinghouse it is the class/object used to store the functions etc.
There should always (or at least in most cases) be an instance of this object stored in a variable like TRADING_HOUSE or TRADING_HOUSE_GAMEPAD which you are able to access ingame then.
Check the source code of eso, here:
http://www.esoui.com/downloads/info1...ourcecode.html
http://esodata.uesp.net/current/index.html
https://github.com/esoui/esoui/tree/master/esoui/ingame
In the files you'll be able to find the info about the clases / Objects and their globally accessibla variables names (most of the time the filenames like tradinghouse.lua got the globally accessible variables near the top or bottom of the file names):
Filename:
https://github.com/esoui/esoui/blob/...e_keyboard.lua
At the bottom:
Lua Code:
--[[ Globals ]]--
function ZO_TradingHouse_OnInitialized(self)
TRADING_HOUSE = ZO_TradingHouseManager:New(self)
SYSTEMS:RegisterKeyboardObject(ZO_TRADING_HOUSE_SYSTEM_NAME, TRADING_HOUSE)
end