velocity auto correlation

hi all
Could one calculate velocity auto correlation function and verlet neighbor list of a tagged particle directly from LAMMPS?

You can get the neighbors of one (or more) atoms, but putting
them in a group and using the dump local command with
its pair options, e.g. compute pair/local and property/atom.

There is no VACF implemented in LAMMPS. You can post-
process it instead.