Header sections can appear anywhere in the file (except within other sections). The following is an example:
(1 "TGrid 2.1.1")
The purpose of this section is to identify the program that wrote the file. Although it can appear anywhere, it is one of the first sections in the file. Additional header sections indicate other programs that may have been used in generating the file. It provides a history mechanism showing where the file came from and how it was processed.