Ron's Fireflies question

in The Commons
One more question about Ron's products...
Specifically Ron's Fireflies.
https://www.daz3d.com/ron-s-fireflies
It contains brushes for Photoshop, and something called Photoshop Layer Styles (.ASL)
I am not sure what .ASL files are or how to use. Is there information on this somewhere?
The most recent product, Ron's Circle Flares, just has .PNG files, which I know how to use on a separate layer in Photoshop.
Comments
If I recall right, layer styles are presets for various layer based adjustments like glow, drop shadow, etc... they change the whole layer to add an effect.
At the 4 minute mark, it explains installing and using Styles (.ASL files).
Thanks for all the answers. I will check out the video.
And I also made a DEMO of this product in full...
Sweet!!! Bookmarking that one too.