Does anyone know how the controlnet for tile actually works? I know you can use it with the ultimat

Does anyone know how the controlnet for tile actually works? I know you can use it with the ultimate sd upscale script and i understand that it modifies the prompt based on what is in each tile. But what does it do in cases where you arent using ultimatr sd upscale? Ive seen demos where people set denoise to 1 and used it to regenerate an image that maintained composition but i cant find anyone who bothers to explain why that actually works. How does it split the image into tiles? What does the tile resamplr preprocessor actually do? Is there a way for me to specify the tiles or slice the image myself?
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