New User - What's the difference Portal Builder and PDK Developer Kit?

I am a bit confused. I have been working with Portal Builder creating some pages. I have currently run across the topic of PDK Developer Kit. How is this different than Portal Builder or is it? Is the PDK download for personal PCs or for the server? What does PDK provide that Builder doesn't?
Thanks.

Hi,
The Oracle Portal Developer Kit (PDK) is a very important & useful component of Oracle Portal. It helps developers ( like me ) to easily convert existing applications into powerful Portlets. It also helps us to get some "context" information from the Portal & take decisions based on it.
You can comfortably use the Portal Builder with the supplied Portlets & develop business solutions - however, at some point, you will notice that you will be working within a confined box. If you need to think "outside-the-box", you will defenitely need to have a look at PDK.
I have shown you the tip of the Iceberg - I would encourage you to download & explore the powerful capabilites of Oracle PDK.
Regards,
Sandeep

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    HR deals with the INFOTYPES which are similar to Tables in General ABAP.
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    http://help.sap.com/printdocu/core/Print46c/en/data/pdf/PAPA/PAPA.pdf
    http://help.sap.com/printdocu/core/Print46c/en/data/pdf/PAPD/PAPD.pdf
    http://help.sap.com/printdocu/core/Print46c/en/data/pdf/PYINT/PYINT_BASICS.pdf
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    http://www.erpgenie.com/faq/hr.htm.
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    http://www.sapgenie.com/faq/hr.htm
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