How specify on the command line which .emacs to use?

[BobD]

Is there a way I can specify on the command line which .emacs file to use?

I am now using this command line: runemacs.exe -q -l /Directory/.emacs
The "-q" means not to use a .emacs file.  The "-l" loads the named file.
But the "-q" suppresses saving customizations.

I'd like something like this: runemacs.exe -dotemacsfile /Directory/.emacs