NW7.3 ABAP+JAVA (PI)

I installed NW7.3 ABAP+JAVA (PI). Now I need to do the configuration part. A prerequisite to run the configuration wizrad is to update to the latest Support Package Stack (both ABAP and JAVA).

I have the following question that I hope some of you may be able to answer:

What is the leading application component that determines the Support Package Stack in ABAP?

How can I tell what is the Support Package Stack level on the java stack?

How can I tell what is the Support Package level of the following Java components:

LMCFG, LMCTC, MESSAGING, SAP_XIAF, SAP_XITOOL, SAPGUILIB and SAP_XIESR

Thanks