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1. You can display iView within SPS web part with the iView web part tool kit.
Link to the article http://www.infoworld.com/article/04/08/09/HNwebpart_1.html
Here’s the workspace on gotdotnet
2. You can setup SAP ITS, to display SAP GUI in SPS Page Viewer Web Part, like this:
3. Microsoft had developed two sample SPS web parts which call SAP web service developed by using .NET connector, to display data from SAP.