I would like my htaccess code to operate only on my small live machine and never the neighborhood, What code can one write within the HTaccess to distinguish?

Inside your local apache VirtualHost add this instruction:

<Directory /my/directory/where/the/htaccess/is >
    # prevent reads of .htaccess files
    AllowOverride None
</Directory>

Then you definitely local Apache won't ever read any .htaccess within this directory (and subdirectories)