use Exporter;  # require works;
@ISA = 'Exporter';
@EXPORT_OK = qw(functions $variables @arrays);
# I put this after the above, some put this above and then use "our".
use strict;

##</code><code>##

# In the main script...
use strict;
use vars qw($foo);
# ... time passes ...
$foo = "whatever";

# In the module...
print $main::foo;