How is footer.vm used in Confluence?

I am new to Confluence, and I am playing with it (version 5.10.7).

I am reading the system’s code, and I am unable to find out how footer.vm is used. Here is how common-header.vm is used: Inside main.vmd, there is the following line:


I am not able to find similar code to use footer.vm.

Thanks for help!