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use CGI related modules;
use HTML::Template;
...
use Myapp::Update qw(update);
#
# you get the picture

# 1. create objects in the main script and pass them around
my $cgi  = new CGI::Simple;
...
# 3. another variation
# besides any mix of the above, don't import/export anything.
# Refer to everything using their long names.