Aside from the fact you are answering a question asked about 50 days ago, I think you misunderstood what he wanted.

I think he simply wanted a list of all *HIS* variable names. Probably would also be nice to have a cross reference (that is, a list of every line each variable is used in). Too bad he's not using an Atari 8-bit computer. We created a version of BASIC for that machine, back in 1982, that did exactly that. "LVAR" listed all your variables with all the line numbers where they were used.