The config file consists of a series of discrete lines. Each line consists of a series of colon-separated fields, the first of which is a single character, which defines what sort of thing the line is describing.
A line may also be a .include directive, which is of the form
.include "file"and causes file to be read in at that point, before the rest of the current file is processed.
Anything from a # to the end of a line is a comment. Blank lines are ignored.