NetWeaver JavaStack - NetWeaver Upgrade Question

Hello Gurus,
Please ignore I sound little uninitiated in this.
This is about the so called JavaStack upgrade after (?) the technical upgrade.
- What exactly is the so called Javastack in netweaver? It is not same as 'Usage Type' Java? Is this AS Java?
- What is the right time to do the JavaStack Upgrade? After technical upgrade?
- How much after tech upgrade? 2-3 weeks are ok? Will the new features of BI 7 not be available till we upgrade the javastack?
- Without upgrdaing to Javastack, will NONE of the new functionalities be available in BI 7.0?
Please help.
Regards
Manish Madhav

In continuation
To use any web based components, including the 2004s Web Application Designer, Report Designer, or Web Analyzer, you need to have BI-JAVA usage type installed.
You can still use the 2004s BEx Analyzer (Excel) without the BI-JAVA usage type.
When you install BI JAVA, it will have its own EP and AS JAVA usage types under it. You have no option with this as they are required to run BI JAVA (just like you have AS ABAP under the BI usage type).
It is recommended that you have all 4 usage types installed (AS-ABAP, AS-JAVA, EP, and BI-JAVA) as this is required for full functionality. These can be on a single system or can be 2 separate systems:
1 system:
System (AS-ABAP, AS-JAVA, BI-JAVA, EP)
2 systems:
System (AS-ABAP)
System (AS-JAVA, BI-JAVA, EP)
Note 1072576 - Frequently Asked Questions: BI Java Support Packages/patches
Hope it Helps
Chetan
@CP..

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