Tweak Menu - where's the documentation or how-to?

[Ltek]

I've searched all over but cannot find any docs or how-to on creating a tweak menu to add to a legacy table

I'm very new and spent a ton of time learning to do some table mods. I've looked at several tables with Tweak Menus but cant figure out thing much of anything. For instance...

What are the script/code prereqs?
Does the .option method only render the menu or does it also read and then save the entries to the INI automatically?
etc

thx