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  $linker->widget("widgetA")->set( page_number => 2 );
  $uri = $linker->uri;
  # $uri is now "/some-page.asp?widgetA.page_number=2"

=head1 DESCRIPTION

C<ASP4x::Linker> aims to solve the age-old problem of:

B<How do I change one widget on the page without losing my settings for all the other widgets on the page?>

OK - say you have one data grid on your web page that allows paging and sorting.  You can move forward and backward between
pages, change the sorting - life's great.  B<THEN> your boss says:

  We need to have two of those on the same page.  One for Albums and one for Genres.

Now you have 2 options.

=over 4

B<Option 1>: If a user pages "Albums" to page 4, then pages "Genres" to page 2, you forget that "Albums" was on page 4.