This has the potential to develop into a large laundry list! Here are my contributions:
1. PDK runs on Tomcat, vs the portal on the SAP J2EE engine - platform-specific differences may show up.
2. Portal may have load-balancing servers, which the PDK does not.
3. PDK is mostly a single-user environment, so the concurrency issues that show up in portal may not show up in the PDK.
4. The PDK only has a subset of the portal functionality.
5. From my experience, the PDK is an approximation of the portal environment, but then it is just that - an approximation. I believe that that is part of the reason a separate PDK environment with a different code-base has been eliminated in EP6.
These are the differences I can think of at the moment - I am sure there are a lot more that can be added to the list.
Atul
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