Linedef 112 assistance.

Simple question, but what will probably be a complex answer.
How do you make Linedef 112 work?

(I've examined the wiki, the 'No Linedef Left Behind' thread, and checked through with search on the forum, to no success.)

the sector it is tagged to has it's tag changed, the linedef length is what tag it will become.

Linedef 112 will not change a fof, it doesn't work like that. If you want to do that, then you will have to use linedef types 101 and 102 on two control sectors are tagged to the same sector. You make one of them be below the floors then you raise the other fof.

I am not sure what the purpose of linedef 112 is.

It also won't change a colormap.