ELEVENWORDINLINE when to use it?

Question

I was always wondering what can I do with things like that:

ONEWORDINLINE(w1)
TWOWORDINLINE(w1, w2)
THREEWORDINLINE(w1, w2, w3)

up to

TENWORDINLINE(w1, w2, w3, w4, w5, w6, w7, w8, w9, w10)
ELEVENWORDINLINE(w1, w2, w3, w4, w5, w6, w7, w8, w9, w10, w11)
TWELVEWORDINLINE(w1, w2, w3, w4, w5, w6, w7, w8, w9, w10, w11, w12)

1. How to use this macros?
2. When to use them?
3. Why from 1 to 12 and not to...100 for example?