Hello and welcome to the forum,
What you want to know is not clear.
The designers of db2 decided to use lds rather than some other access method (the more high-speed access tools i've worked with use bdam).
I'm not sure what you mean by "interact" - the db2 code reads and writes these linear datasets.
It is not really an issue as developers access db2 via sql which is far removed fro direct access.
Possibly i have misunderstood the question. . .
Hope this helps,