how much traffic is going to my site

Conclusion

Now you know how to:

Use references to create and query complex data structures.
Construct and use packages, namespaces, and scoped variables.
Build new applications by reusing methods and functions from Perl modules.
Write object-oriented Perl.
Use Tk to build graphical user interfaces.
Implement client-server networking with sockets.
Simplify data storage and access with DBM files.
Profile program performance with Benchmark.