Windows 10: Microsoft LXM-00004 Ergonomic Keyboard favourite buttons open apps in background / not...

Hi I've had Microsoft keyboards for years, unfortunately a drink + keyboard combination meant my trusty Natural Wireless Ergonomic Keyboard 7000 finally had to be replaced I will never understand why Microsoft stopped making this and why their current range of ergonomic keyboards is so poor. I've had to settle for the LXM-00004 which is the closest match but it's flatness is still something I'm not used to, and the decision to put a context button where the start button should be is crazy!. Anyway.... The LXM-00004 has three favourite buttons at the top left you can have open a program,

:)

 

Microsoft Ergonomic Keyboard (LXM-00001) too sensitive

PLEASE HELP - my new Microsoft Ergonomic Keyboard (LXM-00001) too sensitive

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Microsoft ergonomic keyboard key question

I just purchased a Microsoft Ergonomic Keyboard (LXM-00001) for use with my iMac.
I can't figure out what the key is between the Ctrl and the Windows logo. It looks like a representation of a page with printing on it, and when I press it when I am in Microsoft word a square comes up. Help?

 

Microsoft 4000 ergonomic keyboard play button

A Windows 10 forced update broke my Microsoft 4000 ergonomic keyboard play button. It still sort of works, but now the application window has to be in focus for it to work.

Can this be fixed so it works in the background like it used to?