I understand you're looking for information on taking screenshots with the Stream 8 tablet.
The shortcut you listed for Windows tablets does not work on the Stream 8. To take screenshots of desktop apps you will need to use the Snipping Tool. You can find this by searching Snipping Tool in the start screen.
If you want to share a screenshot of an app you can use the screenshot feature by swiping in from the right, selecting Share, and changing the dropdown at the top right corner to Screenshot and then selecting how to share the screenshot. Choices here are limited, and personally I use Mail to share a .png image by sending it to myself so that I can do what I need with the screenshot.
Hopefully that helps.
Great-Deku-Tree I work on behalf of HP
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You have to use the snipping tool to take a screenshot. On start page click the arrow down to all apps and click snipping tool then select all the area that you want to capture just like how you would crop in paint.