Upgrading PI 7.3 to 7.4 Single Stack

Dear Experts,

I have some concerns regarding to upgrade PI 7.3 to 7.4 Single Stack, kindly need your help on this:

- how to make sure that the PI is installed in dual stack/single stack? I assume if it has IDoc, HTTP adapter (instead of IDOC_AAE, HTTP_AAE) and it runs ccBPM (Process Integration) it still runs on dual stack. Is that correct?

- Is it possible to migrate from PI 7.3 dual stack to 7.4 single stack? I've found in this link that we can migrate objects from the ABAP stack to the Java stack with the provided tool:

http://scn.sap.com/community/process-orchestration/blog/2012/11/19/moving-integration-directory-artifacts-from-dual-stack-to-single-stack#comment-335797

so actually we dont have to rebuilt all the interfaces since we can migrate smoothly but for ccBPM need to be built again with NW BPM. Is there any other part that should be checked?

- Does installing PI 7.4 means we upgrade the NW to 7.4 version too? Should we concern other SAP products that runs on NW?

Any advice would be appreciated.

Thank you,

Suwandi C.