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Windows Desktop Duplication Tool for live coding presentations in C++14
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Windows Desktop Duplication Tool

This is a little tool for live coding presentations.

I like to see the IDE on my laptop screen. But I don’t want to duplicate the screen, so I can see my private notes.

Usage Schema

I could not find such a tool, so I created this.


By default the primary screen is duplicated to a window.


  • Move the window whereever you need it. Beamers for live coding and presentations.

  • You can resize the window as you like. This changes the portion of the screen that is visible.

  • Double Left Mouseclick maximizes the window.

  • Maximized window looses the window frame. Ideal for presentations.

  • Ctrl + Mousewheel ↕/+/- allows you to zoom

  • CtrlShift + Mousewheel ↕ zooms in smaller steps

  • Ctrl + 0 reset zoom to 1:1

  • Shift + Left Mouse Button + Dragging ⇔⇕ allows you to move the visible portion

  • Right Mouse Button + [Focus other Window] will position and resize the other window into the mirrored area. Not all windows will like this.

  • Shift + /// aligns the mirrored image to the border

  • Shift + Right Mouse Button toggle a visualisation of the captured area

  • Ctrl + P toggle pause. Freezes the image.

The tool is optimized to be very response and save CPU time.


2.0 - TBA

  • pause / freeze feature

  • visualization of state in taskbar

  • Your Ideas are welcome (see Contributions)

1.0 - 2017-04-16 (Revision Easter Release)

  • first public version

  • hand crafted at the Revision Demo Party

  • basic features are working


  • DirectX 9+

  • Windows 8.1+


The tool was build using Visual Studio 2017. I made use of modern C++ 14 and beyond features.

The only other thing you need is the DirectX and Windows and WRL headers. All included in the Windows 10 SDK.

If you have issues please ask.


Read the LICENSE file!


If you have issues or questions feel free to open a ticket.

If you can answer a question in a ticket, help is appreciated.

If you like the tool, leave a star on Github and spread the love.

All usefull pull requests are welcome! If you have an idea and are unsure, please open a ticket for discussions.



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