I`m looking to use a mobile OS as my main working machine (at most i just need to browse the internet & use word processors)
Would it be possible to get the ipad to 'extend' (not mirror!!) its 'desktop' to an external monitor?
You can do this in a few very specific ways.
Keynote and PowerPoint have "presenter" views where the slide is shown on an external monitor and a special view with notes, current slide, upcoming slide and a clock/timer are displayed on the iPad.
There are a few other apps that have 'presentation' or sharing modes which do something similar. For example, GoodReader, a PDF view and file organizer, can show documents on an external display while the iPad shows a different screen (file browser or PDF markup mode, though not a different app)
Some games specifically coded for a second screen can show a different display on an external monitor.
But unlike a desktop OS, you can't run two apps on two different displays at the same time. iOS doesn't (yet) have that ability. Apps have to be specifically coded to support a dual-display function.
Any app, on the other hand, can be mirrored on to an external display, but this simply replicates the iPad's screen on the external monitor. There is no support for external touchscreens.
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I do have both of those. I dont entirely understand your suggestion, could you elaborate more? ... is that for remote viewing.. how would it work here?

pity.. I was considering an ipad pro to replicate this 'desktop' experience but then i would lose the ability to type on it like the pic show so I`d need an air anyway.... (plus I want to use clamshell keyboards which I doubt the ipadpro will get...
There are at least two clamshell keyboard cases for the iPad Pro on the market.