What is SI developer?

Hello,

I wanted to know what is a SI developer at SAP. This is my first foray into SDN and SAP. So, I d really appreciate any help I can get for the following questions without affecting any confidentiality issues. Actually, all I need is an answer to the question "What is SI in SI developer at SAP?".

1 What does SI stand for ? Does SI stand for Software Integration ?

2 What SAP products offer SI as a feature or are used to perform SI?

3 What SAP or non SAP technologies would a SI developer work on?

4 Is a SI developer related in any way to SAP SI (http://www.sap-si.com/)?

Thanks a lot for taking the time,

Raymond