7.21.3 Can you answer these questions?

7.21.3.1 Change multicolumn column spec with a star command

https://tex.stackexchange.com/landing/r/digest?cta=question&id=591059

I am trying to make a macro that will wrap the column specification of a \multicolumn command with @{} if a * is passed to my macro. I can achieve the behaviour I want in the first definition below, ... 
[tables] [multicolumn] [xparse] [optional-arguments]
 

asked by likethevegetable https://tex.stackexchange.com/landing/r/digest?cta=user&id=186406 1 vote

answered by Phelype Oleinik https://tex.stackexchange.com/landing/r/digest?cta=user&id=134574 0 votes

7.21.3.2 How to get Anki working with TikZ on Windows?

https://tex.stackexchange.com/landing/r/digest?cta=question&id=590772

I am aware that there is this this question that discusses getting TikZ working with Anki, but it's for a Mac machine, whereas I need to get it working on Windows. 
Also, the accepted (and only) answer ... 
[tikz-pgf] [anki]
 

asked by HPB https://tex.stackexchange.com/landing/r/digest?cta=user&id=238738 1 vote

7.21.3.3 RefTeX and tcbnewtheorem

https://tex.stackexchange.com/landing/r/digest?cta=question&id=591065

I'd like for RefTeX to know about labels defined by tcbtheorem environments. Here's an example where RefTeX does not find the relevant label... 
\documentclass{article} 
\usepackage{tcolorbox} 
\... 
[reftex] [tcbtheorem]
 

asked by tgkolda https://tex.stackexchange.com/landing/r/digest?cta=user&id=10902 1 vote