Is it possible to use GIT with non-standard directory?

[Simon White <mintroll-git 2-72 co uk>]

It is possible to have a GIT repository with a non-standard name, other 
than ".git".


Why would this ever be the case?


It is a helpful trick to maintain multiple GIT repositories in the same 
directory, as described here:

http://stackoverflow.com/questions/436125/two-git-repositories-in-one-directory





So, is it possible to tell Meld to use a non-standard GIT repository? I 
can't seem to find the option anywhere?


(
Also, if the GIT repository isn't even in the same directory:
https://git-scm.com/blog/2010/04/11/environment.html
)