#first application
$ENV{APP_ID} = 'APP_1';
my $obj_1 = FormValidator->new({foo=>'bar'});
my $obj = FormValidator->new();
print $$obj{foo};#prints 'bar'

#second application
my $obj_2 = FormValidator->new({foo=>'BAZ'},'APP_2');
my obj = FormValidator->new();
print $$obj{foo};#prints 'BAZ'