8.34.3 Can you answer these questions?

8.34.3.1 Is whitespace allowed between \section and \index or \label?

https://tex.stackexchange.com/landing/r/digest?cta=question&id=645186

Sometimes I need to add a label or index immediately after a new chapter/section/subsection, etc., and the code may look like: 
\section{TITLE}  \index{INDEX}  \label{LABEL} 
This works fine in my ... 
[macros] [labels] [white-space]
 

asked by Jinwen https://tex.stackexchange.com/landing/r/digest?cta=user&id=194994 Score of 1

8.34.3.2 List all packages, with short description, installed with Texlive

https://tex.stackexchange.com/landing/r/digest?cta=question&id=645128

I need to build a plain text file with a list of all LaTeX packages with a short description, e.g. 
a0poster: Support for designing posters on large paper. 
a2ac: AFM to AFM plus Composites. 
a2ping: ... 
[packages]
 

asked by Gabriele Nicolardi https://tex.stackexchange.com/landing/r/digest?cta=user&id=33634 Score of 1

8.34.3.3 Abstract Syntax Tree (AST) for LaTeX

https://tex.stackexchange.com/landing/r/digest?cta=question&id=645279

I would like to manipulate a LaTeX document in a program, e.g. add/change used packages or their options and adding environments. 
Instead of doing this purely on the text level, it would be great to ... 
[programming] [syntax]
 

asked by J Fabian Meier https://tex.stackexchange.com/landing/r/digest?cta=user&id=7769 Score of 1