Yes the tab key is for inserting a tab character or indenting the code.
I must be a bit more specific:
My colleague use linux and a editor called emacs.
When they indent the following is written in the file:
1) 3 space = 3
2) 6 space = 6
3) tab + 1 space = 9
4) tab + 4 space = 12
5) 1 tab + 7 space = 15
6) 2 tab + 2 space = 18
This is of course cracy but this is what they do to the file, and I have to read and edit there files too.
Reformatting all files would be a way but how do I easy change all tabs to 8 spaces? Search and replace cannot find the Tab char or how do I do that?