just the way 'among' is for 'amongst', 'along' is for ~.
It refers to sm1 or smthing thts next to the subject thts there all the time, as far as the time of concern is concerned.
or simply say: alongst -> at along
1. The bird was flying high, with the cool breeze alongst.(practical)
2. He rambled on with the stupid grin alongst.(abstract)