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use xxx;    #imports all of the symbols in @EXPORT
use xxx (); #imports none of the symbols in @EXPORT
...
use xxx qw(OpenConnection $LoggedOn_user_id); # imports
 # all of the symbols in @EXPORT AND subroutine OpenConnection
 # AND the scalar $LoggedOn_user_id from @EXPORT_OK

#!/usr/bin/perl
use warnings;
...
our $LoggedOn_user_id=33;
our $attempts = 99;
1;

#!/usr/bin/perl
use strict;
...

#Note that $attempts is NOT <strike>exported</strike> imported,
but still #can be accessed by the fully qualified name!