1.20.2 Greatest hits from previous weeks

Greatest hits from previous weeks:

1.20.2.1 Adding more than one author with different affiliation

http://tex.stackexchange.com/questions/9594/adding-more-than-one-author-with-different-affiliation

My goal is adding more than one author with different affiliations, it will look like something: 
Author A, Author B, Author C, Author D and Author E 
A,B,C Department of Computer Science 
...
 

- asked by berkay (70 votes), answered by Thorsten Donig (75 votes)

1.20.2.2 Where do I place my own .sty or .cls files, to make them available to all my .tex files?

http://tex.stackexchange.com/questions/1137/where-do-i-place-my-own-sty-or-cls-files-to-make-them-available-to-all-my-te

I know how to define a package or a class, but how do I make it available (to myself) at all times? 
Say I have the package file commonstuff.sty (or myprettyclass.cls), that I want to be able to  ...
 

- asked by Tomas Lycken (255 votes), answered by Stefan Kottwitz (161 votes)